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Navegação Periódicos - Artigos por Revista "Brazilian Journal of Radiation Sciences"
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MARTINS, E.W.
; POTIENS, M.P.A.
.
Activimeter “in situ” calibration methodology to 111In and 123I.
Brazilian Journal of Radiation Sciences,
v. 11,
n. 1A,
p. 1-9,
2023.
DOI:
10.15392/2319-0612.2023.2212
Abstract:
The activimeter calibration has the purpose of ensure greater reliability in measurement results, hence the activimeters used are commonly installed in controlled areas and, in some cases, with difficult access. The activimeter “in situ” calibration methodology presented in this work allows its execution only with the displacement of the radioactive samples and not of the activimeter itself, which simplifies the procedure of nuclear medicine services and at radiopharmaceuticals production centers, without affecting the quality and accuracy of measurements. After the application of the methodology by qualified technicians, the obtained results of the tested activimeters showed its importance since the calibration factors can present correction of up to 5% for 111In and greater than 5% for 123I.
Palavras-Chave:
calibration;
activity meters;
measuring methods;
in-situ processing
MARTINS, E.W.; POTIENS, M.P.A.
Activimeter “in situ” calibration methodology to 111In and 123I.
Brazilian Journal of Radiation Sciences,
v. 11,
n. 1A,
p. 1-9,
2023.
DOI:
10.15392/2319-0612.2023.2212.
Disponível em: http://repositorio.ipen.br/handle/123456789/34215. Acesso em: $DATA.
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ARMELIN, M.J.A.
; MAIHARA, V.A.
; COZZOLINO, S.M.F.; SILVA, P.S.C.
; SAIKI, M.
.
Activity levels of gamma-emitters in Brazil nuts.
Brazilian Journal of Radiation Sciences,
v. 4,
p. 01-09,
2016.
Abstract:
Activity concentrations of the radionuclides 137Cs, 40K, 226Ra and 228Ra were determined in Brazil nuts acquired at points of sale between 2010 and 2013. Results indicated that the estimated annual effective radioactive dose due to ingestion of Brazil nuts is 27% of the annual dose limit of 1 mSv y-1 for public exposure, according to the Interna-tional Commission on Radiological Protection (ICRP). To estimate this dose the highest activity concentration ob-tained for each radionuclide was considered, assuming an annual consumption of 1.5 kg y-1 per individual.
Palavras-Chave:
activity levels;
cesium 137;
gamma sources;
gamma spectrometers;
gamma spectroscopy;
nuts;
potassium 40;
radium 226;
radium 228
ARMELIN, M.J.A.; MAIHARA, V.A.; COZZOLINO, S.M.F.; SILVA, P.S.C.; SAIKI, M.
Activity levels of gamma-emitters in Brazil nuts.
Brazilian Journal of Radiation Sciences,
v. 4,
p. 01-09,
2016.
Disponível em: http://repositorio.ipen.br/handle/123456789/26916. Acesso em: $DATA.
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SMITH, RICARDO B.
; SACHDEVA, MAHIMA; BISURI, INDRANIL; VICENTE, ROBERTO
.
Advanced heavy water reactor: a new step toward sustainability.
Brazilian Journal of Radiation Sciences,
v. 8,
n. 3A,
p. 1-18,
2020.
DOI:
10.15392/bjrs.v8i3A.1368
Abstract:
One of the great advances in the current evolution of nuclear power reactors is occurring in India, with the Advanced Heavy Water Reactor (AHWR). It is a reactor that uses thorium as part of its fuel, which in its two fueling cycle options, in conjunction with plutonium or low enriched uranium, produces energy at the commercial level, generating less actinides of long half-life and inert thorium oxide, which leads to an optimization in the proportion of energy produced versus the production of burnt fuels of the order of up to 50%. The objective of this work is to present the most recent research and projects in progress in India, and how the expected results should be in compliance with the current sustainability models and programs, especially the "Green Chemistry", a program developed since the 1990s in the United States and England, which defines sustainable choices in its twelve principles and that can also be mostly related to the nuclear field. Nevertheless, in Brazil, for more than 40 years there has been the discontinuation of research for a thorium-fueled reactor, and so far there has been no prospect of future projects. The AHWR is an important example as an alternative way of producing energy in Brazil, as the country has the second largest reserve of thorium on the planet.
Palavras-Chave:
fuel element clusters;
hwlwr type reactors;
nuclear fuels;
radioactive wastes;
reactor design;
sustainable development;
thorium;
india
SMITH, RICARDO B.; SACHDEVA, MAHIMA; BISURI, INDRANIL; VICENTE, ROBERTO.
Advanced heavy water reactor: a new step toward sustainability.
Brazilian Journal of Radiation Sciences,
v. 8,
n. 3A,
p. 1-18,
2020.
DOI:
10.15392/bjrs.v8i3A.1368.
Disponível em: http://repositorio.ipen.br/handle/123456789/31949. Acesso em: $DATA.
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FERREIRA, D.C.; DEL MASTRO, N.L.
.
An analysis of the support and quality of live after the diagnosis and treatment of prostate cancer in the radiotherapy sector.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-18,
2021.
DOI:
10.15392/bjrs.v9i1A.1384
Abstract:
Prostate cancer is the most common chronic disease among men in most parts of the world. According to the National Cancer Institute (INCA) in Brazil in 2018, 68,000 new cases were registered. Among the main treatments the radiotherapy has been shown to be effective in controlling and curing the disease. However, it is noted that the patient satisfaction index is not the most encouraging and there is little research that points to the support of the hospital team. The aim of this study was to collect data from medical records about the adverse effect of the disease and through questionnaire the level of knowledge about the disease and the support offered by sector and to make recommendations for radiotherapy units Data were collected from 147 patients and of that total, 51 answered the questionnaire. The survey also shows that there was little referral to the complementary therapeutic service during of treatment. It is identified that more than 50% them knew very little about prostate cancer and 42% had no participation in the choice of treatment. It is observed that it is difficult to insert support policies for patients with prostate cancer, the professionals who work in oncology and radiotherapy centers underestimate the effects of the disease. It is observed, through research, that many of the symptoms and debilitations could be mitigated if there was a greater interaction between the health team and the patient, reducing the effects of radiation and accelerating the patient's integration for the social environment.
Palavras-Chave:
neoplasms;
patients;
prostate;
quality of life;
radiation effects;
radiotherapy;
recommendations
FERREIRA, D.C.; DEL MASTRO, N.L.
An analysis of the support and quality of live after the diagnosis and treatment of prostate cancer in the radiotherapy sector.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-18,
2021.
DOI:
10.15392/bjrs.v9i1A.1384.
Disponível em: http://repositorio.ipen.br/handle/123456789/32106. Acesso em: $DATA.
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GASPARIAN, P.B.R.
; MALTHEZ, A.L.M.C.; MARIANO, L.; CAMPOS, L.L.
; POLITANO, R.
.
An overview study on the TL and OSL dosimetry patent processes over time.
Brazilian Journal of Radiation Sciences,
v. 11,
n. 1,
p. 1-15,
2023.
DOI:
10.15392/2319-0612.2023.2107
Abstract:
Since its discovery, ionizing radiation has been used in many different applications. Materials and methods have
been developed to measure and quantify radiation doses. Thermoluminescence (TL) and Optically Stimulated
Luminescence (OSL) are two techniques used for radiation dosimetry. Both TL and OSL are primarily applied
in several areas, such as dating of ancient materials, equipment quality control and individual monitoring. One
of the parameters to measure the knowledge and development of a technology is the number of patents related to
the field. In this work, we established a methodology for patent search on the World Intellectual Property
Organization (WIPO) database aiming to review the development of TL and OSL dosimetry over time. We
concluded that along with the OSL technique development, the TL technique should continue to be explored in
radiation dosimetry.
Palavras-Chave:
dosimetry;
patents;
thermoluminescence;
property management;
photoluminescence
GASPARIAN, P.B.R.; MALTHEZ, A.L.M.C.; MARIANO, L.; CAMPOS, L.L.; POLITANO, R.
An overview study on the TL and OSL dosimetry patent processes over time.
Brazilian Journal of Radiation Sciences,
v. 11,
n. 1,
p. 1-15,
2023.
DOI:
10.15392/2319-0612.2023.2107.
Disponível em: http://repositorio.ipen.br/handle/123456789/34216. Acesso em: $DATA.
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SILVA, C.A.J.
; BRAGUIN, L.N.M.
; ROSSI, J.L.
; SCAPIN, M.A.
; COSTA, I.
; SAIKI, M.
.
Analyses of magnesium-based alloys by nuclear techniques.
Brazilian Journal of Radiation Sciences,
v. 10,
n. 3B,
p. 1-12,
2022.
DOI:
10.15392/2319-0612.2022.1969
Abstract:
Magnesium-based alloys have been proposed for use in temporary biomaterials in the applications that request their biocompatibility and degradability. Analyses of these alloys are of great interest to verify if their element composition is within the product specification and also to evaluate the impurities that may cause toxic effects to the human health or influence in their corrosion processes. In this study, nuclear techniques of neutron activation analysis (NAA) and wavelength dispersive X ray fluorescence spectrometry (WD XRFS) were applied in the analyses of two magnesium-based alloys: commercially pure magnesium (CP-Mg) and AZ31 alloy. The NAA procedure consisted of irradiation aliquots of sample and synthetic element standards followed by measurements using a HGe detector and the WD XFRS was carried out using the Model RIX 3000 X-ray spectrometer. In the CP-Mg sample several element impurities were quantified. In the AZ31 alloy, the alloying element mass fractions were within the product specification and the impurities of As, La, Na and Sb were also quantified. Nickel and sulfur were quantified only by WD XFRS. The Horwitz method was a good parameter to evaluate the repeatability of the results in Al, Mg, Mn and Zn determinations. In conclusion, the results indicated the viability of using NAA and WD XFRS in the analyses of magnesium-based materials mainly due its multielement determinations, precision of the results, quantification of elements in a wide range of mass fractions and the lack of need for sample dissolution.
Palavras-Chave:
magnesium base alloys;
biological materials;
biodegradation;
decomposition;
fluorescence spectroscopy;
x-ray fluorescence analysis;
x radiation;
specifications
SILVA, C.A.J.; BRAGUIN, L.N.M.; ROSSI, J.L.; SCAPIN, M.A.; COSTA, I.; SAIKI, M.
Analyses of magnesium-based alloys by nuclear techniques.
Brazilian Journal of Radiation Sciences,
v. 10,
n. 3B,
p. 1-12,
2022.
DOI:
10.15392/2319-0612.2022.1969.
Disponível em: http://repositorio.ipen.br/handle/123456789/33496. Acesso em: $DATA.
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KOIKE, A.C.R.
; ARAUJO, E.S.; NEGRAO, B.G.
; ALMEIDA-MURADIAN, L.B.; VILLAVICENCIO, A.L.C.H.
.
Analysis of carotenoids in edible flowers of Dianthus chinensis processed by ionizing radiation.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-11,
2021.
DOI:
10.15392/bjrs.v9i1A.1577
Abstract:
Dianthus chinensis flowers are widely used in culinary preparations and are appreciated because of its bioactive compounds. It is a perishable food that should be grown without the use of pesticides. In this context, food irradiation is a process that has proven to be an efficient tool in preserving and extending the perishable product shelf life without changing the temperature or leaving residues. The purpose of this study was to evaluate carotenoids in D. chinensis flowers submitted to gamma irradiation and electron beam doses of 0.5, 0.8, and 1.0 kGy. High-performance liquid chromatography for carotenoid determination was used. In the edible flower analyzed was found carotenoid lutein (4.02 to 7.52 mg/ 100 g). The lutein was higher for irradiated samples, especially those treated with 0.8 and 1.0 kGy in both irradiation technology. In conclusion, the lutein amount in the chinese pink enhances as the dose increases, and the applied irradiation treatments represent a feasible technology to preserve the nutritional quality of edible flower petals as well as attend to food safety requirements.
Palavras-Chave:
carotenoids;
cobalt 60;
flowers;
food processing;
gamma radiation;
high-performance liquid chromatography
KOIKE, A.C.R.; ARAUJO, E.S.; NEGRAO, B.G.; ALMEIDA-MURADIAN, L.B.; VILLAVICENCIO, A.L.C.H.
Analysis of carotenoids in edible flowers of Dianthus chinensis processed by ionizing radiation.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-11,
2021.
DOI:
10.15392/bjrs.v9i1A.1577.
Disponível em: http://repositorio.ipen.br/handle/123456789/32147. Acesso em: $DATA.
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BEZERRA, ANDRE de S.
; ZEITUNI, CARLOS A.
; ROSTELATO, MARIA E.C.M.
.
Analysis of patients with prostate cancer care at a reference hospital in the state of Tocantins, suitable for brachytherapy.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-13,
2021.
DOI:
10.15392/bjrs.v9i1A.1545
Abstract:
Observation and identification of predictive factors for results and morbidity are essential in the ideal selection of patients who can use brachytherapy as a treatment modality for prostate cancer. Thus, the objective of this research is to analyze the population of patients with prostate cancer treated at the General Public Hospital of Palmas in 2015, in the state of Tocantins. The method used was quantitative, with the characteristics of a retrospective, transversal and descriptive analysis. Held in the largest state health unit, the General Public Hospital of Palmas that, despite its large dimensions, lives with the main problems of the Unified Health System, such as overcrowding and shortages. It was found that most of the patients seen corresponded to the age of 70 to 79 years, making 45%, followed by patients aged between 60 and 69 years, with 33%. Most of the individuals attended were from the state of Tocantins, but some lived in an adjacent city in the state of Pará. Data related to the Gleason score showed that there was a predominance of levels 6 and 7 indicating intermediate grade tumors, considering that the most of the observed population was older. It was concluded that the analyzed patients had a predominant staging of CaP II and III, thus most of the individuals, 23 of the 35 analyzed, were not able to undergo brachytherapy due to the high degree of disease staging.
Palavras-Chave:
carcinomas;
prostate;
patients;
health services;
brachytherapy;
therapeutic uses;
statistical data
BEZERRA, ANDRE de S.; ZEITUNI, CARLOS A.; ROSTELATO, MARIA E.C.M.
Analysis of patients with prostate cancer care at a reference hospital in the state of Tocantins, suitable for brachytherapy.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-13,
2021.
DOI:
10.15392/bjrs.v9i1A.1545.
Disponível em: http://repositorio.ipen.br/handle/123456789/32140. Acesso em: $DATA.
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KUAHARA, L.T.
; CORREA, E.L.
; POTIENS, M.P.A.
.
Análise da variação da atividade de uma amostra de 99mTc após diluição com soro fisiológico.
Brazilian Journal of Radiation Sciences,
v. 05,
n. 03-A,
p. 01-10,
2017.
Abstract:
O ativímetro é um equipamento essencial em um serviço de medicina nuclear. Garantir seu bom funcionamento e conhecer os fatores que podem influenciar na sua leitura é fundamental para que a atividade administrada ao paciente esteja correta. Vários fatores podem causar alterações na resposta do ativímetro, como o tipo de recipi-
ente, geometria e volume do radioisótopo. O objetivo deste trabalho foi analisar as variações nas medições de 0,5 mL e 1,0 mL de 99mTc puro e diluído em até 2,5 mL de soro fisiológico, em recipientes utilizados em medicina nuclear. Foram encontradas variações de até 4 % nos valores medidos.
Palavras-Chave:
activity meters;
metering;
nuclear medicine;
quality control;
radiation dose units;
radiation protection;
technetium 99;
variations;
variations
KUAHARA, L.T.; CORREA, E.L.; POTIENS, M.P.A.
Análise da variação da atividade de uma amostra de 99mTc após diluição com soro fisiológico.
Brazilian Journal of Radiation Sciences,
v. 05,
n. 03-A,
p. 01-10,
2017.
Disponível em: http://repositorio.ipen.br/handle/123456789/28574. Acesso em: $DATA.
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RIOS, D.A.S.
; RIOS, P.B.; SORDI, G.M.A.A.
; CARNEIRO, J.C.G.G.
.
Análise de situações de exposição potencial em aceleradores de elétrons autoblindados.
Brazilian Journal of Radiation Sciences,
v. 7,
n. 3,
p. 1-15,
2019.
DOI:
10.15392/bjrs.v7i3.851
Abstract:
Neste estudo foram estimadas as doses decorrentes de situações de exposição potencial em uma indústria de embalagens que utiliza um acelerador de elétrons autoblindado para a cura de tintas e vernizes em substratos poliméricos. Para isso foram avaliadas as probabilidades de falhas no sistema de segurança do acelerador e realizadas simulações envolvendo duas situações acidentais que poderiam levar à exposição potencial de Indivíduos Ocupacionalmente Expostos e Indivíduos do Público. Embora estas situações de exposição sejam pouco prováveis e envolva um número pequeno de indivíduos o estudo ressalta a importância de realizar exercícios de simulação permitindo identificar as possíveis falhas de operação e as consequências radiológicas para esse tipo de evento. Os exercícios de simulação realizados apontaram a necessidade de incluir a equipe de intervenção para saneamento do acidente, representada pela brigada de incêndio a qual foi incluída nos treinamentos periódicos de proteção radiológica. Além disso, as estimativas de falha no sistema de segurança e as doses resultantes demonstraram a conformidade aos requisitos de proteção radiológica.
Palavras-Chave:
accelerators;
accidents;
failures;
occupational exposure;
probabilistic estimation;
radiation protection;
safety analysis;
self-shielding;
simulation
RIOS, D.A.S.; RIOS, P.B.; SORDI, G.M.A.A.; CARNEIRO, J.C.G.G.
Análise de situações de exposição potencial em aceleradores de elétrons autoblindados.
Brazilian Journal of Radiation Sciences,
v. 7,
n. 3,
p. 1-15,
2019.
DOI:
10.15392/bjrs.v7i3.851.
Disponível em: http://repositorio.ipen.br/handle/123456789/30377. Acesso em: $DATA.
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ABREU, R.T.
; ANGELOCCI, L.V.
; NOGUEIRA, B.R.
; SANTOS, H.N.
; ZEITUNI, C.A.
; ROSTELATO, M.E.C.M.
.
Anisotropy function of a new 192-Ir brachytherapy source.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-15,
2021.
DOI:
10.15392/bjrs.v9i1A.1506
Abstract:
Brachytherapy is a type of radiotherapy that uses radioactive sources (seeds, wires, among others) close to the tumor. Is important to provide a detailed description of seed dosimetry, so only the tumor will be irradiated avoiding unnecessary dose on adjacent organs and structures. To evaluate the dosimetric parameter of the anisotropy function for a new brachytherapy source, this work proposes the use of microcube TLD-100 dosimeters to find the dose rate using the AAPM Task Group 43 protocol (TG-43). The anisotropy function represents dose distribution around the source and has a major role for characterization of a new iridium source being implemented in Brazil. The value of D(r,θ) was measured using Solid Water phantoms, r value being the distance from the geometric center of the source to the position of the dosimeter on the phantom, and θ being the angle formed between the longitudinal axis of the source and the line connecting the geometric center to the TLD. Monte Carlo calculations were performed to evaluate the anisotropy function to validate the experimental measurements. For each distance value (r), an anisotropy function was plotted (1.0, 2.0, 3.0, 4.0, 5.0, and 10.0 cm). The results obtained with Monte Carlo calculations agreed ±2% with the experimental values for r greater than 3.0 cm, so these results show a good distribution of dose around the seed considering the high energy of 192-Ir (average of 380 KeV) and encapsulation thickness.
Palavras-Chave:
anisotropy;
brachytherapy;
dose rates;
dosimetry;
iridium 192;
monte carlo method;
phantoms;
radiation dose distributions;
radiation source implants;
sealed sources;
thermoluminescent dosemeters
ABREU, R.T.; ANGELOCCI, L.V.; NOGUEIRA, B.R.; SANTOS, H.N.; ZEITUNI, C.A.; ROSTELATO, M.E.C.M.
Anisotropy function of a new 192-Ir brachytherapy source.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-15,
2021.
DOI:
10.15392/bjrs.v9i1A.1506.
Disponível em: http://repositorio.ipen.br/handle/123456789/32130. Acesso em: $DATA.
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KOIKE, A.C.R.
; BARROS, L.; ANTONIO, A.L.; FERREIRA, I.C.F.R.; VILLAVICENCIO, A.L.C.H.
.
Antioxidant activity of Dianthus chinensis flowers processed by ionizing radiation.
Brazilian Journal of Radiation Sciences,
v. 7,
n. 2A,
p. 1-9,
2019.
DOI:
10.15392/bjrs.v7i2A.674
Abstract:
Edible flowers are increasingly used in culinary preparations, which require new approaches to improve their conservation and safety. Irradiation treatment is safe and an effective alternative for food conservation. Indeed, it can also guarantee food quality, increasing shelf-life and disinfestation of it. This technology gives us a versa-tile way to get good quality food, reducing post-harvest losses. Dianthus chinensis flowers, popularly known as Chinese pink, are widely used in culinary preparations, being also acknowledged for their bioactive components and antioxidant properties. The purpose of this study was to evaluate the antioxidant activity of D. chinensis flowers submitted to electron beam and gamma irradiation at 0, 0.5, 0.8 and 1 kGy. The antioxidant properties were evaluated through 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity, reducing power and β-carotene bleaching inhibition assays. Total phenolics were also determined by the Folin-Ciocalteu assay. The antioxidant activity was higher for irradiated samples, especially those treated with 0.8 and 1 kGy, independent-ly of the radiation source, which showed the highest capacity to inhibit β-carotene bleaching. Accordingly, the applied irradiation treatments seemed to represent feasible technology to preserve the quality of edible flower petals, being able to improve the antioxidant activity.
Palavras-Chave:
antioxidants;
dpph;
electron beams;
flowers;
quality assurance;
phenols;
gamma radiation;
food processing
KOIKE, A.C.R.; BARROS, L.; ANTONIO, A.L.; FERREIRA, I.C.F.R.; VILLAVICENCIO, A.L.C.H.
Antioxidant activity of Dianthus chinensis flowers processed by ionizing radiation.
Brazilian Journal of Radiation Sciences,
v. 7,
n. 2A,
p. 1-9,
2019.
DOI:
10.15392/bjrs.v7i2A.674.
Disponível em: http://repositorio.ipen.br/handle/123456789/29926. Acesso em: $DATA.
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HARDER, M.N.C.
; BREVIGLIERI, E.; OLIVEIRA, B.B.; ZAMBONI, K.; CARVALHO, S.; NEME-OYAN, F.F.; HARDER, L.N.C.; OLIVEIRA, S.R.
; ARTHUR, V.
.
Apple porridge submitted to gamma radiation for shelf-life extended.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-11,
2021.
DOI:
10.15392/bjrs.v9i1A.1372
Abstract:
Among many apple products, apple porridge is a popular product nowadays. It is a practical, healthy and tasty product that can be consumed throughout the day. However, it is an extremely perishable product. Therefore, the aim of this work was to evaluate the shelf-life period of apple porridge after the application of gamma radiation as a conservation technology. After the formulation of apple porridge was developed, which was subjected to gamma radiation at the dose of 1kGy in a dose tax of 0.356 kGy.hour-1 and compared this treatment with the control group (0kGy). From the results presented, it can be concluded that the conservation period of apple porridge submitted to gamma radiation is 60 days. From the 90th day, the samples showed microbial growth, becoming not accepted for consumption. In comparison to the control group, the use of gamma radiation was promising, since the standard sample showed contamination before 30 days. By the results it can be concluded that the dose used was adequate for the conservation of this product for the period evaluated.
Palavras-Chave:
apples;
cobalt 60;
coliforms;
food processing;
fungi;
gamma radiation;
irradiation;
ph value;
radiation doses;
storage life
HARDER, M.N.C.; BREVIGLIERI, E.; OLIVEIRA, B.B.; ZAMBONI, K.; CARVALHO, S.; NEME-OYAN, F.F.; HARDER, L.N.C.; OLIVEIRA, S.R.; ARTHUR, V.
Apple porridge submitted to gamma radiation for shelf-life extended.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-11,
2021.
DOI:
10.15392/bjrs.v9i1A.1372.
Disponível em: http://repositorio.ipen.br/handle/123456789/32104. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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GERALDO, R.R.; PASCHUK, S.A.; BARRETO, R.C.; CORREA, J.N.; ZAHN, G.S.
; SILVA, P.S.C. da
; SILVA, A.M. da; NARLOCH, D.C.; ARAUJO, I.C..
Application of a semi-empirical model for the evaluation of radium activity in phosphogypsum used as component of clinker.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-15,
2021.
DOI:
10.15392/bjrs.v9i1A.1518
Abstract:
Phosphogypsum is a residue that has been used by the cement industry as a substitute for the natural gypsum, used as a clinker additive during the production of Portland cement. There is a potential increase in this residue consumption since large amounts of phosphogypsum are generated as outcome of the phosphate fertilizer industries. However, phosphogypsum can be considered a source of radioactive contamination due to the presence of 226Ra in its composition. Depending on the concentration of 226Ra, from the radiological protection point of view, this may cause a problem because this radionuclide and its direct decay product 222Rn along with other decay products, represent the largest fraction of radiation internal dose received by people. In order to evaluate the level of radiological risk that may be associated with the use of phosphogypsum, it is necessary to identify the concentration of 226Ra in building materials. The aim of this research is to analyze samples of phosphogypsum in relation to the concentrations of 226Ra, determined indirectly through 222Rn activity measurements. This measurement process has the advantage of being fast, convenient and relatively inexpensive when compared to traditional methods of 226Ra concentration in samples measurements. The proposed physical-mathematical model was used to establish radium concentration from radon exhalation rate from cement mortar samples. The 222Rn activity measurements were performed with a portable detector with cubic phosphate samples with 50 mm edges each placed in a closed atmosphere of the sampling chamber until secular equilibrium is achieved. Obtained concentrations of radium activity in studied samples of phosphogypsum and cement mortars were found below the limits recommended by CNEN and international regulation.
Palavras-Chave:
building materials;
concentration ratio;
exhalation;
gypsum cements;
phosphates;
radiation detectors;
radiation protection;
radioactivity;
radium 226;
radon 222
GERALDO, R.R.; PASCHUK, S.A.; BARRETO, R.C.; CORREA, J.N.; ZAHN, G.S.; SILVA, P.S.C. da; SILVA, A.M. da; NARLOCH, D.C.; ARAUJO, I.C.
Application of a semi-empirical model for the evaluation of radium activity in phosphogypsum used as component of clinker.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-15,
2021.
DOI:
10.15392/bjrs.v9i1A.1518.
Disponível em: http://repositorio.ipen.br/handle/123456789/32133. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
SCAPIN, M.A.
; GUILHEN, S.N.
; AZEVEDO, L.C.
; COTRIN, M.E.B.
; PIRES, M.A.F.
.
Application of bias correction methods to improve U3Si2 sample preparation for quantitative analysis by WDXRF.
Brazilian Journal of Radiation Sciences,
v. 7,
n. 2A,
p. 1-9,
2019.
DOI:
10.15392/bjrs.v7i2A.582
Abstract:
The determination of silicon (Si), total uranium (U) and impurities in uranium-silicide (U3Si2) samples by wavelength dispersion X-ray fluorescence technique (WDXRF) has been already validated and is currently implemented at IPEN’s X-Ray Fluorescence Laboratory (IPEN-CNEN/SP) in São Paulo, Brazil. Sample preparation requires the use of approx-imately 3 g of H3BO3 as sample holder and 1.8 g of U3Si2. However, because boron is a neutron absorber, this proce-dure precludes the recovery of U3Si2 from the samples, preventing its use as nuclear fuel. Consequently, a significant amount of uranium is wasted in this process. An estimated average of 15 samples per month is expected to be analyzed by WDXRF, resulting in approx. 320 g of U3Si2 that wouldn’t return to the nuclear fuel cycle. The purpose of this paper is to present a new preparation method, replacing H3BO3 by cellulose acetate {[C6H7O2(OH)3-m(OOCCH3)m], m = 0~3}, thus enabling the recovery of the boron-free U3Si2 from the samples. The results demonstrate that the suggested sample preparation approach is statistically satisfactory, allowing the optimization of the procedure.
Palavras-Chave:
quantitative chemical analysis;
sample preparation;
uranium silicides;
x-ray fluorescence analysis;
boron 10;
boric acid;
acetates;
corrections;
errors;
impurities;
mathematical models;
optimization
SCAPIN, M.A.; GUILHEN, S.N.; AZEVEDO, L.C.; COTRIN, M.E.B.; PIRES, M.A.F.
Application of bias correction methods to improve U3Si2 sample preparation for quantitative analysis by WDXRF.
Brazilian Journal of Radiation Sciences,
v. 7,
n. 2A,
p. 1-9,
2019.
DOI:
10.15392/bjrs.v7i2A.582.
Disponível em: http://repositorio.ipen.br/handle/123456789/29954. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
ALBANO, A.M.S.
; ARTHUR, V.
.
Application of gamma radiation in pea (Pisum sativum L.) in nature to inhibit sprouting and increase shelf life.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-20,
2021.
DOI:
10.15392/bjrs.v9i1A.1439
Abstract:
The irradiation of fresh post-harvest foods has as main interests: inhibit sprouting, increase shelf life, reduce or delay damage caused by insects and diseases. This work is a preliminary study on the use of gamma radiation in fresh peas grains (Pisum sativum L.) in order to evaluate its effects on the inhibition of sprout and its increase in shelf life. The peas were submitted at irradiation process with four radiation doses: 0 (control), 0.15, 0.30 and 0.45 kGy, in a 60Co research irradiator, with a dose rate of 0.323 kGy/h. After irradiation the samples were stored at 8 °C, being evaluated at 1, 7, 14 and 21 days by analyzes of: visual aspect, weight loss, color, hardness, pH, total soluble solids, total titratable acidity, ratio SST/TTA, water content and ash. By the results it was observed that in all parameters analyzes with gamma radiation doses used did not affect significantly in the shelf life of grains. The 0.30 kGy dose increased the germination of the peas and the 0.45 kGy dose was not sufficient to inhibit the sprouting of the peas.
Palavras-Chave:
chemical analysis;
cobalt 60;
food processing;
gamma radiation;
peas;
radiation dose units;
radiation effects;
sprout inhibition;
storage life
ALBANO, A.M.S.; ARTHUR, V.
Application of gamma radiation in pea (Pisum sativum L.) in nature to inhibit sprouting and increase shelf life.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-20,
2021.
DOI:
10.15392/bjrs.v9i1A.1439.
Disponível em: http://repositorio.ipen.br/handle/123456789/32115. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
NOGUEIRA, A.G.
; NEGRAO, B.G.
; ARTHUR, V.; VILLAVICENCIO, A.L.C.H.
.
Application of ionizing radiation in the "licuri" (Syagrus coronata (Mart.)) as phytosanitary treatment of the Pachymerus nucleorum beetle (Fabricius, 1792).
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-9,
2021.
DOI:
10.15392/bjrs.v9i1A.1576
Abstract:
Pachymerus nucleorum (Fabricius, 1792), is a pest of economic importance it causes direct damages to the
“licuri” almonds. The objective of this study was to determine the lethal doses of gamma radiation for stages egg,
larvae, and pupae of this insect as a phytosanitary treatment in “licuri”. The samples were irradiated in a Cobalt
60 irradiator, Gammacell-220 type, installed at the Institute of Energy and Nuclear Research - IPEN / CNEN at
a dose rate of 748 Gy / h. Each treatment consisted of 3 replicates, so 180 licuri were irradiated in the doses of 50,
75, 100, and 125 Gy. After irradiation, the samples were stored at a temperature of 25 ± 5°C and relative
humidity of 70 ± 5%. The evaluation of the fruits was performed by the emergence of insects. It is concluded that
the dose of 125 Gy was sufficient to inhibit the development of insect life stages. Therefore, this dose of radiation
can be used for control of the immature stages of the P. nucleorum.
Palavras-Chave:
coconuts;
beetles;
larvae;
pupae;
pest control;
food processing;
cobalt 60;
lethal doses;
radiation doses
NOGUEIRA, A.G.; NEGRAO, B.G.; ARTHUR, V.; VILLAVICENCIO, A.L.C.H.
Application of ionizing radiation in the "licuri" (Syagrus coronata (Mart.)) as phytosanitary treatment of the Pachymerus nucleorum beetle (Fabricius, 1792).
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-9,
2021.
DOI:
10.15392/bjrs.v9i1A.1576.
Disponível em: http://repositorio.ipen.br/handle/123456789/32146. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
COSTA, A.F.; MUNITA, C.S.
; ZUSE, S.; KIPNIS, R..
Archaeometry and Archaeology: preliminary studies of the ceramics from archaeological sites of the upper Madeira river/Rondônia - Brazil.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-16,
2021.
DOI:
10.15392/bjrs.v9i1A.1424
Abstract:
In southwest Amazonia, in the region of the Upper Madeira River, Rondônia, archaeological research has shown that communities with diverse cultures co-existed in the pre-colonial past (ca. 1,000 BP). Archaeological sites from this period located on river banks and islands consist of large extensions of ceramic deposits which reflect different daily activities and social positions that existed within these groups. The complexity of these societies is attested to by the diversity of both ceramic forms and iconography. In this work, 140 ceramic fragments from eight archaeological sites were studied by means of instrumental neutron activation analysis (INAA) to determine Na, K, La, Sm, Yb, Lu, U, Sc, Cr, Fe, Co, Zn, Rb, Cs, Ce, Eu, Hf, Ta and Th mass fractions, with the purpose of classifying and ordering artifacts which are related to one another in their chemical compositions. The analytical method used is adequate for this type of study because it is a semi-destructive technique with high sensitivity and precision that can determine chemical elements in trace and ultra-trace levels, essential for studying small variations in elemental concentrations. Multivariate statistical analyses were used to evaluate the dataset. Initially the mass fractions were normalized to compensate for the large difference in magnitude among elements determined in percentage and in trace level. Subsequently, the mass fraction data were interpreted through cluster analysis, discriminant analysis and a log-log scatterplot. The results showed the existence of four compositional groups, indicating different clay sources.
Palavras-Chave:
archaeology, ceramics;
chemical composition;
clays;
cluster analysis;
elements;
gamma spectra;
multivariate analysis;
neutron activation analysis;
rivers;
scatterplots
COSTA, A.F.; MUNITA, C.S.; ZUSE, S.; KIPNIS, R.
Archaeometry and Archaeology: preliminary studies of the ceramics from archaeological sites of the upper Madeira river/Rondônia - Brazil.
Brazilian Journal of Radiation Sciences,
v. 9,
n. 1A,
p. 1-16,
2021.
DOI:
10.15392/bjrs.v9i1A.1424.
Disponível em: http://repositorio.ipen.br/handle/123456789/32114. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
NISTI, M.B.
; NERY, A.D.
; SAUEIA, C.H.R.
; CAVALCANTE, F.
.
Assessment of natural radioactivity in bottled mineral water from Brazil.
Brazilian Journal of Radiation Sciences,
v. 10,
n. 3B,
p. 1-15,
2022.
DOI:
10.15392/2319-0612.2022.1795
Abstract:
The approach taken in the WHO Guidelines for controlling radiological hazards in public water supplies has two stages. The first is an initial screening for gross alpha and beta activity to determine whether the activity concentrations are below levels at which no further action is required; and if these screening levels are exceeded, investigation of the concentration of individual radionuclides and comparison with specific guidance levels. Mineral water is obtained directly from natural sources or by extracting groundwater, it is characterized by the quantity of mineral salts, trace elements and other constituents. The bottled water industry is present in the major regions of the world, and the population consumption has increased every year in Brazil and world, also increasing new mineral water mining sites, so it is necessary to constantly check the amount of radioactivity in mineral water. The aim of this study is to quantify the concentration of the natural radionuclides in the bottled mineral water consumed in São Paulo city. The bottled mineral water samples were purchased in a supermarket in São Paulo, with 23 different brands. The determination of gross alpha and beta activity concentration in bottled mineral water by Liquid Scintillation Counting measurement was performed using a 1220 Quantulus™ Ultra Low-Level Liquid Scintillation Spectrometer. The natural radionuclides (226Ra, 228Ra, 210Pb and 40K) were measured by gamma spectrometry, using an HPGe detector. The results obtained in this study can be used for a database on bottled mineral water radioactivity from Brazil.
Palavras-Chave:
natural radioactivity;
drinking water;
effective radiation doses;
lead 210;
potassium 40;
radon 226;
radon 228;
radiation effects;
radiation protection;
radioecological concentration;
recommendations
NISTI, M.B.; NERY, A.D.; SAUEIA, C.H.R.; CAVALCANTE, F.
Assessment of natural radioactivity in bottled mineral water from Brazil.
Brazilian Journal of Radiation Sciences,
v. 10,
n. 3B,
p. 1-15,
2022.
DOI:
10.15392/2319-0612.2022.1795.
Disponível em: http://repositorio.ipen.br/handle/123456789/33505. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
FONTOLAN, A.F.A.M.
; SOUZA, C.D. de
.
Assessment of public perception of radioactivity in Brazil.
Brazilian Journal of Radiation Sciences,
v. 10,
n. 4,
p. 1-19,
2022.
DOI:
10.15392/2319-0612.2022.2095
Abstract:
Nuclear energy divides public opinion with its “good” and “bad” applications. Almost immediately after the discovery of radiation, radioactive elements purified by the Curies were used in health treatments, but with the nuclear bombs of Hiroshima and Nagasaki, the subject was marked by bad public opinion, being related to death and destruction. Nowadays, nuclear physics is used in many important fields, such nuclear medicine for the diagnosis and treatment of various types of diseases, but the prejudice and lack of knowledge of the general public has not yet improved its “fame”. This work proposes to change a little of this paradigm. Through a questionnaire, the public perception of radioactivity was evaluated. The most important result obtained is that the public is interested in learning about radiation and nuclear energy and is willing to change their negative views.
FONTOLAN, A.F.A.M.; SOUZA, C.D. de.
Assessment of public perception of radioactivity in Brazil.
Brazilian Journal of Radiation Sciences,
v. 10,
n. 4,
p. 1-19,
2022.
DOI:
10.15392/2319-0612.2022.2095.
Disponível em: http://repositorio.ipen.br/handle/123456789/33922. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
Como referenciar este item
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A pesquisa no RD utiliza os recursos de busca da maioria das bases de dados. No entanto algumas dicas podem auxiliar para obter um resultado mais pertinente.
✔ É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do
Buscar no Repositório
, isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.
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tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro,
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apresenta uma relação com os autores vinculados ao IPEN; o
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diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome;
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diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.
A opção
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Exemplo:
Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.
Autor: Maprelian
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Tipo de publicação: Texto completo de evento
Ano de publicação: 2015
✔ Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da
International Atomic Energy Agency – IAEA
, por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.
✔ 95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o
significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN,
bibl@ipen.br
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✔ Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.
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✔ Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).
ATENÇÃO!
ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.
O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.
A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.
1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI,
clique aqui.
2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI,
clique aqui.
O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.
Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.
A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.
O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.