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Navegação por Revista "Radiation Physics and Chemistry"
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RUIZ, C.S.B.; MACHADO, L.D.B.
; SEGURA PINO, E.
; SAMPA, M.H.O.
.
Characterization of a clear coating cured by UV/EB radiation.
Radiation Physics and Chemistry,
v. 63,
n. 3/6,
p. 481-483,
2002.
Palavras-Chave:
radiation curing;
ultraviolet radiation;
electron beams;
coatings;
polymers;
radiation doses;
tensile properties
RUIZ, C.S.B.; MACHADO, L.D.B.; SEGURA PINO, E.; SAMPA, M.H.O.
Characterization of a clear coating cured by UV/EB radiation.
Radiation Physics and Chemistry,
v. 63,
n. 3/6,
p. 481-483,
2002.
Disponível em: http://repositorio.ipen.br/handle/123456789/6088. Acesso em: $DATA.
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GONCALVES, JOSEMARY A.C.
; MANGIAROTTI, ALESSIO; BUENO, CARMEN C.
.
Characterization of a thin photodiode as a routine dosimeter for low-dose radiation processing applications.
Radiation Physics and Chemistry,
v. 198,
p. 1-7,
2022.
DOI:
10.1016/j.radphyschem.2022.110200
Abstract:
The characterization of a dosimetry system based on a commercial PIN photodiode as a routine dosimeter in a
60Co industrial facility is reported. The main parameters of the dose rate response (repeatability, reproducibility,
and angular dependence) and the dose response (dependence on both dose rate and accumulated dose) are
investigated. The results obtained, within a dose rate range of 3.7–52.8 Gy/h and doses up to 200 Gy, fully
adhere to the standard protocols established for radiation processing dosimetry. The diode performance as a
routine dosimeter is validated by the good overall agreement with radiochromic films and alanine dosimetry.
Palavras-Chave:
photodiodes;
thin films;
gamma radiation;
dosimetry;
silicon diodes
GONCALVES, JOSEMARY A.C.; MANGIAROTTI, ALESSIO; BUENO, CARMEN C.
Characterization of a thin photodiode as a routine dosimeter for low-dose radiation processing applications.
Radiation Physics and Chemistry,
v. 198,
p. 1-7,
2022.
DOI:
10.1016/j.radphyschem.2022.110200.
Disponível em: http://repositorio.ipen.br/handle/123456789/33206. Acesso em: $DATA.
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POLO, IVON O.
; SANTOS, WILLIAM S.
; CALDAS, LINDA V.E.
.
Characterization of an extrapolation chamber in beta radiation beams and Monte Carlo modelling.
Radiation Physics and Chemistry,
v. 171,
p. 1-9,
2020.
DOI:
10.1016/j.radphyschem.2020.108746
Abstract:
At the Calibration Laboratory (LCI) of the IPEN/CNEN, studies are in development on the establishment of a
standard composed by the beta radiation sources for the dosimetry and calibration for personal monitoring in
Brazil. For this purpose is used the Böhm extrapolation chamber (PTW model 23392). This chamber was already
characterized at LCI in 90Sr/90Y beams using two different entrance windows: one of aluminized Mylar and
another of PET (polyethylene terephthalate) known as Hostaphan. In this work, this extrapolation chamber was
characterized in 85Kr and 147Pm beams. All tests were carried out with the reference 90Sr /90Y source, for
comparison purposes. The Monte Carlo code MCNP5 code was used to obtain an extrapolation chamber and the
BSS2 system sources computational model, based on the determination of the absorbed dose rate. Saturation
curves, ion collection efficiency, ion recombination, polarity effect, stability of response, null depth, linearity of
response, variation of response as a function of source-detector distance, extrapolation curves, correction factors
and absorbed dose rates were obtained. The difference between the experimental absorbed dose rates and those
obtained using the Monte Carlo model, compared to those from the calibration certificates, was less than 1.9%
for the 108 histories for each BSS2 system source. All results of the performed tests are within the limits of the
international recommendations. The results for the 90Sr/90Y source were in good agreement with previous works
performed at LCI. These results are suitable for the establishment of a standard instrument for the dosimetry and
calibration of beta radiation sources and detectors in the LCI/IPEN. This standard will allow the calibration of
detectors in beta radiation beams in dosimetry services in Brazil.
Palavras-Chave:
extrapolation chambers;
radiation doses;
beta sources;
monte carlo method;
calibration;
calibration standards;
laboratories
POLO, IVON O.; SANTOS, WILLIAM S.; CALDAS, LINDA V.E.
Characterization of an extrapolation chamber in beta radiation beams and Monte Carlo modelling.
Radiation Physics and Chemistry,
v. 171,
p. 1-9,
2020.
DOI:
10.1016/j.radphyschem.2020.108746.
Disponível em: http://repositorio.ipen.br/handle/123456789/31423. Acesso em: $DATA.
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OLIVEIRA, LUCAS N. de
; NASCIMENTO, ERIBERTO O. do; ANDREETA, MARCELLO R.B.; ANTONIO, PATRICIA L.
; CALDAS, LINDA V.E.
.
Characterization of lithium diborate, sodium diborate and commercial sodalime glass exposed to gamma radiation via linearity analyses.
Radiation Physics and Chemistry,
v. 155,
SI,
p. 133-137,
2019.
DOI:
10.1016/j.radphyschem.2018.06.031
Abstract:
The linearity characteristic in radiation dosimetry presents a growing interest. Glasses have been applied to high
radiation doses. In this work, materials will be analyzed and compared in relation to their linearity ranges.
Lithium diborate, sodium diborate and commercial glass were irradiated with doses from 10 Gy to 10 kGy using
a 60Co Gamma-Cell system 220 and evaluated with the UV–vis technique. The sensitivity analyses were applied
through four methodologies, searching for linear regions in their response. The results show that all four applied
analyses indicate linear regions for the tested radiation detectors. The materials with higher linearity range, in
descending order, were lithium diborate, sodium diborate and commercial soda-lime glass. The radiation detectors
present potential use for radiation dosimetry in intermediate and high doses.
Palavras-Chave:
borates;
lithium compounds;
sodium compounds;
dosimetry;
ultraviolet spectra;
visible spectra;
dose rates;
radiation doses
OLIVEIRA, LUCAS N. de; NASCIMENTO, ERIBERTO O. do; ANDREETA, MARCELLO R.B.; ANTONIO, PATRICIA L.; CALDAS, LINDA V.E.
Characterization of lithium diborate, sodium diborate and commercial sodalime glass exposed to gamma radiation via linearity analyses.
Radiation Physics and Chemistry,
v. 155,
p. 133-137,
2019.
SI,
DOI:
10.1016/j.radphyschem.2018.06.031.
Disponível em: http://repositorio.ipen.br/handle/123456789/29777. Acesso em: $DATA.
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NONATO, FERNANDA B.C.
; SAKURABA, ROBERTO K.; CRUZ, JOSE C. da; CALDAS, LINDA V.E.
.
Characterization tests of a new parallel plate ionization chamber for use in electron beams.
Radiation Physics and Chemistry,
v. 104,
p. 244-247,
2014.
Palavras-Chave:
ionization chambers;
electron beams;
dosimetry;
linear accelerators
NONATO, FERNANDA B.C.; SAKURABA, ROBERTO K.; CRUZ, JOSE C. da; CALDAS, LINDA V.E.
Characterization tests of a new parallel plate ionization chamber for use in electron beams.
Radiation Physics and Chemistry,
v. 104,
p. 244-247,
2014.
Disponível em: http://repositorio.ipen.br/handle/123456789/23189. Acesso em: $DATA.
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SILVA, J.O.; NONATO, F.B.C.; CALDAS, L.V.E.
.
Characterizations tests of a homemade ionization chamber in mammography standard radiation beams.
Radiation Physics and Chemistry,
v. 95,
p. 151-153,
2014.
Palavras-Chave:
biomedical radiography;
ionization chambers;
dosimetry;
calibration;
mammary glands;
x radiation
SILVA, J.O.; NONATO, F.B.C.; CALDAS, L.V.E.
Characterizations tests of a homemade ionization chamber in mammography standard radiation beams.
Radiation Physics and Chemistry,
v. 95,
p. 151-153,
2014.
Disponível em: http://repositorio.ipen.br/handle/123456789/3992. Acesso em: $DATA.
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SAVI, MATHEUS
; ANDRADE, MARCO A.B.; POTIENS, MARIA P.A.
.
Commercial filament testing for use in 3D printed phantoms.
Radiation Physics and Chemistry,
v. 174,
p. 1-7,
2020.
DOI:
10.1016/j.radphyschem.2020.108906
Abstract:
There is a great demand for phantoms by many areas of knowledge to be used for teaching or daily work.
However, commercial phantoms are expensive and hard to obtain, especially in countries going through development.
As an alternative, 3D printing can be the way to produce less expensive and reliable 3D phantoms.
The goal of this study is to evaluate 14 available commercial filaments, in order to find if and how they can be
used in 3D printed phantoms in computed tomography. Each material was printed as a 2 cm edge cube with
rectilinear pattern and 60, 80 and 100% infill. The 80% infill of five other patterns were also printed and
compared. Each 100% infill cube was weighted and had its density calculated. After that, the cubes were scanned
in a Philips CT Brilliance 6 with 120 kVp, 200 mA, 2 mm slices and standard reconstruction. At the center of each
cube, a ~120 mm2 region of interest was set to measure the mean Hounsfield Unit (HU) and its standard
deviation. The software Origin was used to plot HU results for rectilinear pattern, determine linear trends with its
R2 and compare achieved values with HU tissue range from literature. To confirm the response of HU values of
selected tested materials in CT imaging as a function of percentage infill, a phantom prototype of a finger was 3D
printed. The HU of the tested materials ranged from −516.2 ± 7.3 to 329.8 ± 18.9. All human tissues could
be mimicked making use of these materials, except cortical bone above ~350 HU and tooth parts. The most
promising filament was PLA + Cu, due to the multiple infill configuration that allows the resulting HU range to
represent from adipose and skin tissue to marrow bone.
Palavras-Chave:
3d printing;
phantoms;
fabrication;
filaments;
radiology;
computerized tomography
SAVI, MATHEUS; ANDRADE, MARCO A.B.; POTIENS, MARIA P.A.
Commercial filament testing for use in 3D printed phantoms.
Radiation Physics and Chemistry,
v. 174,
p. 1-7,
2020.
DOI:
10.1016/j.radphyschem.2020.108906.
Disponível em: http://repositorio.ipen.br/handle/123456789/31424. Acesso em: $DATA.
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RODRIGUES JUNIOR, A.A.; CALDAS, L.V.E.
.
Commercial plate window glass tested as routine dosimeter at a gamma irradiation facility.
Radiation Physics and Chemistry,
v. 63,
n. 3/6,
p. 765-767,
2002.
Palavras-Chave:
dosimetry;
dosemeters;
glass;
gamma radiation;
cobalt 60;
irradiation devices;
radiation doses;
spectrophotometry
RODRIGUES JUNIOR, A.A.; CALDAS, L.V.E.
Commercial plate window glass tested as routine dosimeter at a gamma irradiation facility.
Radiation Physics and Chemistry,
v. 63,
n. 3/6,
p. 765-767,
2002.
Disponível em: http://repositorio.ipen.br/handle/123456789/6101. Acesso em: $DATA.
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NASCIMENTO, BRUNA C.; FRIMAIO, AUDREW
; BARRIO, RAMON M.M.; SIRICO, ANA C.A.; COSTA, PAULO R..
Comparative analysis of the transmission properties of tissue equivalent materials.
Radiation Physics and Chemistry,
v. 167,
p. 1-7,
2020.
DOI:
10.1016/j.radphyschem.2019.04.050
Abstract:
Phantom objects have as main requirement to have the effective atomic number and linear attenuation coefficient
approximately equal to the human tissue to be simulated. The present work aims to characterize samples of
materials radiologically equivalent to water for dose studies in patients in the diagnostic energy range. Water
was chosen as reference material representing human tissue, which is composed mostly of it. A set of samples
was formulated and submitted to radiation transmission tests in four different values of tension applied to an Xray
tube. Mass densities of the samples were evaluated using the Arquimedes method. The samples were
identified as A, B, C and D. By transmission curves, it was possible to estimate the samples transmission factors
corresponding to the water transmission factor for different thicknesses. Moreover, the thicknesses of samples
equivalent to water thickness for different values of transmission factor were also evaluated. All the samples
densities were bigger than the density of water. For the same thickness of water and the samples, the radiation
transmission of the developed materials are in better agreement for thicknesses of 10mm and 30 mm. The lowest
percentage difference between the water transmission and the transmission of any of the samples obtained was
approximately 0.6% for the sample A in the thickness of 30mm under voltage of 60 kV. The correspondence
between the transmission factors and the thicknesses showed that the compounds studied in this work are
potential materials to develop phantoms that simulate the transmission properties of human tissue.
Palavras-Chave:
tissue-equivalent materials;
radiation protection;
transmission;
experimental data;
comparative evaluations;
data transmission;
phantoms
NASCIMENTO, BRUNA C.; FRIMAIO, AUDREW; BARRIO, RAMON M.M.; SIRICO, ANA C.A.; COSTA, PAULO R.
Comparative analysis of the transmission properties of tissue equivalent materials.
Radiation Physics and Chemistry,
v. 167,
p. 1-7,
2020.
DOI:
10.1016/j.radphyschem.2019.04.050.
Disponível em: http://repositorio.ipen.br/handle/123456789/31425. Acesso em: $DATA.
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COSENTINO, HELIO M.; TAKINAMI, PATRICIA Y.I.
; MASTRO, NELIDA L. del
.
Comparative of the ionizing radiation effects on cochineal, annatto and turmeric natural dyes.
Radiation Physics and Chemistry,
v. 124,
p. 208-211,
2015.
Palavras-Chave:
food additives;
color;
ionizing radiations;
carminic acid;
comparative evaluations;
dyes;
spectrophotometry;
electrophoresis;
curcumin
COSENTINO, HELIO M.; TAKINAMI, PATRICIA Y.I.; MASTRO, NELIDA L. del.
Comparative of the ionizing radiation effects on cochineal, annatto and turmeric natural dyes.
Radiation Physics and Chemistry,
v. 124,
p. 208-211,
2015.
Disponível em: http://repositorio.ipen.br/handle/123456789/25342. Acesso em: $DATA.
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ALMEIDA, S.B.
; VILLANI, D.
; SAKURABA, R.K.; REZENDE, A.C.P.; CAMPOS, L.L.
.
Comparative study of the TL response of LiF:Mg,Ti and CaSO4:Dy in the clinical electron beams dosimetry applied to total skin irradiation (TSEB) treatments.
Radiation Physics and Chemistry,
v. 155,
SI,
p. 121-126,
2019.
DOI:
10.1016/j.radphyschem.2018.05.025
Abstract:
The commissioning and quality assurance The Total Skin Electron Beam (TSEB) irradiation treatment is based on the AAPM's report 23, which describes the six-dual-field (Standford) technique, and the Hospital Israelita Albert Einstein (HIAE) follows this recommended guidance. The Dosimetric Materials Laboratory of the Instituto de Pesquisas Energéticas e Nucleares (IPEN-LMD) has tradition in research related to thermoluminescent materials and its clinical applications. Thus, aiming to apply the LiF:Mg,Ti, the most common TLD material, and CaSO4:Dy + Teflon produced at IPEN as easy-to-use alternatives to electron beams dosimetry and its parameters applied to TSEB, this paper reports a comparative study of the TL responses of both materials to dose evaluation in TSEB treatments. The TL response of both materials was evaluated in several TSEB parameter tests such as clinical field homogeneity, Monitor Units (MU) calculation, absorbed doses over the reference line and throughout the surface of the skin in a treatment simulation using AldersonRando anthropomorphic phantom. Results show that the field homogeneity measurements remained within ± 8% acceptance limit from AAPM Report 23, little to no energy dependency over the range of 4 o 9 MeV electron beams and, for clinical measurements and MU calculations, both TLDs present compatible results and can be used as alternative tools in TSEB dosimetry.
Palavras-Chave:
lithium fluorides;
thermoluminescence;
thermoluminescent dosimetry;
skin;
calcium sulfates;
dysprosium;
dosimetry
ALMEIDA, S.B.; VILLANI, D.; SAKURABA, R.K.; REZENDE, A.C.P.; CAMPOS, L.L.
Comparative study of the TL response of LiF:Mg,Ti and CaSO4:Dy in the clinical electron beams dosimetry applied to total skin irradiation (TSEB) treatments.
Radiation Physics and Chemistry,
v. 155,
p. 121-126,
2019.
SI,
DOI:
10.1016/j.radphyschem.2018.05.025.
Disponível em: http://repositorio.ipen.br/handle/123456789/29260. Acesso em: $DATA.
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ALMEIDA, S.B.
; VILLANI, D.
; SAKURABA, R.K.; REZENDE, A.C.P.; CAMPOS, L.L.
.
Comparison between Al2O3:C pellets and DIODEs for TSEB in vivo dosimetry using an anthropomorphic phantom.
Radiation Physics and Chemistry,
v. 167,
p. 1-4,
2020.
DOI:
10.1016/j.radphyschem.2019.02.030
Abstract:
The Total Skin Electron Beam (TSEB) therapy is a technique that aims to provide skin surface homogeneous
absorbed dose in order to treat cutaneous T-cell lymphomas, both for curative and palliative purposes with
electron beams penetrating a few millimeters into the skin, reaching the affected parts without affecting internal
organs. In vivo dosimetry has become an important role for the treatment of total skin irradiation within a
rigorous quality assurance. The luminescent dosimeters, such as TLDs and OSLDs, have proven to be very useful
for the verification of the dose distribution and prescribed for the patient as the dose may differ from place to
place due to patient body geometry, overlapping of structures and asymmetries of the radiation field. Other
routine in vivo dosimetry tool is the DIODEs and they as well help validating radiation therapy dosimetry.
Al2O3:C OSL pellets manufactured and marketed by REXON Components and TLD Systems have already been
characterized for TSEB applications. The aim of this work is to compare the performance of Al2O3:C OSL pellets
from REXON to in vivo TSEB dosimetry with silicon DIODEs QEDTM detectors from Sun Nuclear (EUA) using an
anthropometric phantom. Dosimeters and DIODEs were previously characterized for 6 MeV HDTSe- electron
beams and then placed over an Anderson Rando® anthropomorphic phantom, evaluating the body dose distribution.
The reference point of measurement was the umbiculous as recommended by formalism. The results
showed that the Al2O3:C OSL pellets presented acceptable results, but some greater variation of the response in
relation to silicon DIODEs were found due to its considerable rotational dependency.
Palavras-Chave:
electron beams;
skin;
skin diseases;
neoplasms;
lymphomas;
dosimetry;
in vivo;
aluminium oxides;
carbon;
phantoms;
silicon diodes;
external irradiation
ALMEIDA, S.B.; VILLANI, D.; SAKURABA, R.K.; REZENDE, A.C.P.; CAMPOS, L.L.
Comparison between Al2O3:C pellets and DIODEs for TSEB in vivo dosimetry using an anthropomorphic phantom.
Radiation Physics and Chemistry,
v. 167,
p. 1-4,
2020.
DOI:
10.1016/j.radphyschem.2019.02.030.
Disponível em: http://repositorio.ipen.br/handle/123456789/31426. Acesso em: $DATA.
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FREITAS, LUCAS F. de
; CRUZ, CASSIA P.C. da
; CAVALCANTE, ADRIANA K.
; BATISTA, JORGE G. dos S.
; VARCA, GUSTAVO H.C.
; MATHOR, MONICA B.
; LUGAO, ADEMAR B.
.
Comparison between gold nanoparticles synthesized by radiolysis and by EGCG-driven gold reduction.
Radiation Physics and Chemistry,
v. 174,
p. 1-9,
2020.
DOI:
10.1016/j.radphyschem.2020.108959
Abstract:
Radiolytic synthesis and phytochemical-driven gold reduction for the generation of nanoparticles are successful
examples of Green Chemistry applied for nanomaterials. The present work compares these two green approaches
focusing on hydrodynamic size, stability over time, optical properties and toxicity in NIH 3T3 (ATCC® CRL-
1658™) cells and Danio rerio (Zebra Fish). The radiolytic synthesis was performed by mixing 1 mM NaAuCl4;
polyvinyl pyrrolidone 0.5%, AgNO3 6×10−5 M, propan-2-ol 0.2 M and acetone 0.06 M, followed by irradiation
at 15 kGy (5 kGy h−1, 60Co source). The EGCG-functionalized nanoparticles were synthesized by mixing 1.6 mM
of Au with 0.8 mM of EGCG in phosphate buffer (10 mM) for 2 h. Both methods yield the formation of gold
nanoparticles featuring plasmon resonance bands at 520–530 nm, polydispersity above 0.3 was relevant only for
the radiolytic protocol. Regarding stability over time, after 30 days, the nanoparticles synthesized radiolytically
presented no relevant size changes, while some aggregation was observed for the EGCG-particles. The same
nanoparticles demonstrated a lack of stability in high ionic strength medium. Slight toxicity was observed for the
EGCG-nanoparticles in Danio rerio, with an IC50 calculated as 40.49%, while no IC50 was established within the
concentration range of radiolysis-AuNPs used in this study. In conclusion, both green methods generated nanoparticles
with good control of size and optical properties, especially via reduction by EGCG. However, the
stability and toxicity results were found to be more promising for the radiolytically synthesized gold nanoparticles.
Palavras-Chave:
gold;
nanoparticles;
synthesis;
chemistry;
ecology;
polyphenols;
fishes
FREITAS, LUCAS F. de; CRUZ, CASSIA P.C. da; CAVALCANTE, ADRIANA K.; BATISTA, JORGE G. dos S.; VARCA, GUSTAVO H.C.; MATHOR, MONICA B.; LUGAO, ADEMAR B.
Comparison between gold nanoparticles synthesized by radiolysis and by EGCG-driven gold reduction.
Radiation Physics and Chemistry,
v. 174,
p. 1-9,
2020.
DOI:
10.1016/j.radphyschem.2020.108959.
Disponível em: http://repositorio.ipen.br/handle/123456789/31427. Acesso em: $DATA.
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TEIXEIRA, BRUNA S.
; GARCIA, RAFAEL H.L.
; TAKINAMI, PATRICIA Y.I.
; DEL MASTRO, NELIDA L.
.
Comparison of gamma radiation effects on natural corn and potato starches and modified cassava starch.
Radiation Physics and Chemistry,
v. 142,
p. 44-49,
2018.
DOI:
10.1016/j.radphyschem.2017.09.001
Abstract:
The objective of this work was to evaluate the effect of irradiation treatment on physicochemical properties of three natural polymers, i.e. native potato and corn starches and a typical Brazilian product, cassava starch modified through fermentation-sour cassava- and also to prepare composite hydrocolloid films based on them. Starches were irradiated in a Co-60 irradiation chamber in doses up to 15 kGy, dose rate about 1 kGy/h. Differences were found in granule size distribution upon irradiation, mainly for corn and cassava starch but radiation did not cause significant changes in granule morphology. The viscosity of the potato, corn and cassava starches hydrogels decreased as a function of absorbed dose. Comparing non-irradiated and irradiated starches, changes in the Fourier transform infrared (FTIR) spectra in the 2000-1500 cm(-1) region for potato and corn starches were observed but not for the cassava starch. Maximum rupture force of the starch-based films was affected differently for each starch type; color analysis showed that doses of 15 kGy promoted a slight rise in the parameter b* (yellow color) while the parameter L* (lightness) was not significantly affected; X-ray diffraction patterns remained almost unchanged by irradiation.
Palavras-Chave:
starch;
cassava;
potatoes;
gamma radiation;
viscosity;
fourier transform spectrometers;
x-ray diffraction;
infrared spectrometers;
radiation effects;
absorbed radiation doses;
cobalt 60;
dose rates;
films;
irradiation;
visible radiation;
x radiation
TEIXEIRA, BRUNA S.; GARCIA, RAFAEL H.L.; TAKINAMI, PATRICIA Y.I.; DEL MASTRO, NELIDA L.
Comparison of gamma radiation effects on natural corn and potato starches and modified cassava starch.
Radiation Physics and Chemistry,
v. 142,
p. 44-49,
2018.
DOI:
10.1016/j.radphyschem.2017.09.001.
Disponível em: http://repositorio.ipen.br/handle/123456789/28857. Acesso em: $DATA.
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VIEIRA, F.F.; DEL MASTRO, N.L.
.
Comparison of gamma-radiation and electron beam irradiation effects on gelatin.
Radiation Physics and Chemistry,
v. 63,
n. 3/6,
p. 331-332,
2002.
Palavras-Chave:
gelatin;
irradiation;
ionizing radiations;
gamma radiation;
cobalt 60;
electron beams;
viscosity;
comparative evaluations
VIEIRA, F.F.; DEL MASTRO, N.L.
Comparison of gamma-radiation and electron beam irradiation effects on gelatin.
Radiation Physics and Chemistry,
v. 63,
n. 3/6,
p. 331-332,
2002.
Disponível em: http://repositorio.ipen.br/handle/123456789/6034. 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
-
COSENTINO, HELIO M.; TAKINAMI, PATRICIA Y.I.
; MASTRO, NELIDA L. del
.
Comparison of the ionizing radiation effects on cochineal, annatto and turmeric natural dyes.
Radiation Physics and Chemistry,
v. 124,
p. 208-211,
2016.
Palavras-Chave:
comparative evaluations;
food;
color;
ionizing radiations;
dyes;
gamma radiation;
spectroscopy;
electrophoresis
COSENTINO, HELIO M.; TAKINAMI, PATRICIA Y.I.; MASTRO, NELIDA L. del.
Comparison of the ionizing radiation effects on cochineal, annatto and turmeric natural dyes.
Radiation Physics and Chemistry,
v. 124,
p. 208-211,
2016.
Disponível em: http://repositorio.ipen.br/handle/123456789/26525. 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
-
NEVES, LUCIO P.; FRANCO, ADRIANE B.; FRANÇA, MONIQUE; SOARES, MARIA R.; BELINATO, WALMIR; SANTOS, WILLIAM S.
; CALDAS, LINDA V.E.
; PERINI, ANA P..
Computational dosimetry in a pediatric i-CAT procedure using virtual anthropomorphic phantoms.
Radiation Physics and Chemistry,
v. 167,
p. 1-5,
2020.
DOI:
10.1016/j.radphyschem.2019.03.040
Abstract:
The craniofacial structure is three-dimensional, and for a better visualization of these structures, Computed
Tomography is often employed for diagnoses, even though being a high-cost procedure, leading to increased
exposure to ionizing radiation. As a consequence, studies in dosimetry are necessary, since several radiosensitive
structures are located in the head and neck, such as thyroid, crystalline and salivary glands. There is an overall
consensus regarding the exposure of pediatric patients to ionizing radiation, with recommendations being that
the procedures must occur with the shortest exposure time as possible, and it is only prescribed when they are
effectively necessary. During the procedures, radiation effects are difficult to be measured. The use of either TL
or OSL dosimeters can create artifacts within the images, and the positioning of a large number of dosimeters,
necessary for the correct dose evaluation, is not feasible when it comes to a pediatric patient. Therefore pediatric
virtual anthropomorphic phantoms and Monte Carlo simulations were used in this work. The absorbed and
effective doses were determined during an i-CAT procedure, with 5 different fields of view, utilizing 5- and 10-
year-old male virtual anthropomorphic phantoms. The results pointed out that the eye lens, salivary glands and
thyroid received the highest doses. Besides, the effective dose values increase with the increasing of the FOV size,
and the 5-year-old male virtual anthropomorphic phantom presented the highest effective dose values.
Palavras-Chave:
ionizing radiations;
pediatrics;
dosimetry;
monte carlo method;
phantoms;
computerized simulation
NEVES, LUCIO P.; FRANCO, ADRIANE B.; FRANÇA, MONIQUE; SOARES, MARIA R.; BELINATO, WALMIR; SANTOS, WILLIAM S.; CALDAS, LINDA V.E.; PERINI, ANA P.
Computational dosimetry in a pediatric i-CAT procedure using virtual anthropomorphic phantoms.
Radiation Physics and Chemistry,
v. 167,
p. 1-5,
2020.
DOI:
10.1016/j.radphyschem.2019.03.040.
Disponível em: http://repositorio.ipen.br/handle/123456789/31428. 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
-
TRINDADE, R.A.; LIMA, A.; ANDRADE WARTHA, E.R.; OLIVEIRA e SILVA, A.M.; MANCINI FILHO, J.; VILLAVICENCIO, A.L.C.H.
.
Consumer's evaluation of the effects of gamma irradiation and natural antioxidants on general acceptance of frozen beef burger.
Radiation Physics and Chemistry,
v. 78,
n. 4,
p. 293-300,
2009.
Palavras-Chave:
meat;
food processing;
antioxidants;
radiation effects;
comparative evaluations
TRINDADE, R.A.; LIMA, A.; ANDRADE WARTHA, E.R.; OLIVEIRA e SILVA, A.M.; MANCINI FILHO, J.; VILLAVICENCIO, A.L.C.H.
Consumer's evaluation of the effects of gamma irradiation and natural antioxidants on general acceptance of frozen beef burger.
Radiation Physics and Chemistry,
v. 78,
n. 4,
p. 293-300,
2009.
Disponível em: http://repositorio.ipen.br/handle/123456789/7988. 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
-
ALVARENGA, TALLYSON S.
; POLO, IVON O.
; PEREIRA, WALSAN W.; SILVA, FELIPE S.; FONSECA, EVALDO S.; CALDAS, LINDA V.E.
.
Contribution of the scattered radiation on the neutron beam fluence at the calibration laboratory of IPEN.
Radiation Physics and Chemistry,
v. 167,
p. 1-5,
2020.
DOI:
10.1016/j.radphyschem.2019.03.023
Abstract:
In recent years, an upsurge in demand for neutron calibrations has been experienced in Brazil and several other
countries in Latin America, mainly due to the increase in oil prospection and extraction procedures. The only
laboratory for calibration of neutron detectors in Brazil is located at the Institute for Radioprotection and
Dosimetry (IRD/CNEN), Rio de Janeiro. This laboratory is the national standard dosimetry laboratory in Brazil.
With the increase in the demand for the calibration of neutron detectors, the need for more calibration services
became evident. In this context, the Calibration Laboratory of IPEN/CNEN, São Paulo, which already offers
calibration services of radiation detectors with standard X, gamma, beta and alpha beams, recently projected a
new calibration laboratory for neutron detectors. One of the main problems in this kind of calibration laboratory
is related to the knowledge of scattered radiation. In order to evaluate it, simulations were performed without
the presence of the structural elements and with the complete room. Thirteen measurement points were evaluated
at various distances. As part of the characterization process of the radiation fields of the new Neutron
Calibration Laboratory, this work presents results on the influence of the radiation scattered by the structural
components of the room: walls, doors, ceiling and floor, in different calibration positions, on the detector response.
Therefore, the neutron radiation attenuation and the scattering parameters were determined at different
source-detector distances, through computational simulation, using the MCNP5 Monte Carlo code.
Palavras-Chave:
radiation scattering analysis;
neutron detectors;
calibration;
monte carlo method;
neutron fluence;
calibration standards
ALVARENGA, TALLYSON S.; POLO, IVON O.; PEREIRA, WALSAN W.; SILVA, FELIPE S.; FONSECA, EVALDO S.; CALDAS, LINDA V.E.
Contribution of the scattered radiation on the neutron beam fluence at the calibration laboratory of IPEN.
Radiation Physics and Chemistry,
v. 167,
p. 1-5,
2020.
DOI:
10.1016/j.radphyschem.2019.03.023.
Disponível em: http://repositorio.ipen.br/handle/123456789/31429. 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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-
CUNHA, J.S.; SANTOS, W.S.
; CARVALHO JUNIOR, A.B..
Conversion Coefficients of equivalent and effective doses in terms of air kerma for computational scenarios of Total Body Irradiation in lying-down patients.
Radiation Physics and Chemistry,
v. 159,
p. 138-146,
2019.
DOI:
10.1016/j.radphyschem.2019.02.051
Abstract:
This study aimed to calculate the Conversion Coefficients (CC) of Equivalent and Effective doses by air kerma
considering Total Body Irradiation scenarios with Varian linear accelerator with photon beams energy of 4, 6,
10, 15, 18, and 25 MV. The simulations were performed in the MCNPX code and the University of Florida (UF)
phantoms were used to represent exposed lying down adult patients in the AP, PA, RLAT, and LLAT irradiation
geometries. Lead attenuators were inserted in the scenarios for the preservation of organs of risk and their
contribution were analyzed for CC. For most counts, the statistical uncertainty was approximately 5%. For the
gonads, CC values for the male phantom decreased with the increase of energy in the AP geometry, which did not
occur for the female phantom. As the beam becomes more penetrating, the ovary absorbs more energy because
of its internal position. Considering the lung, an organ of risk in TBI, the insertion of the attenuators in the
scenarios caused the CC values to reduce by more than 30%. For organs and tissues such as skin and male
breasts, the attenuators caused the dose to increase. As for the active bone marrow, which is the TBI target tissue,
it was not possible to obtain a good estimate for CC at 15, 18, and 25 MV due to a limitation of the method used
to calculate the dose in the bone areas. Nevertheless, for lower energies the CC values for the marrow were valid.
Palavras-Chave:
conversion;
equivalent dose range;
kerma;
whole-body irradiation;
patients;
ionizing radiations;
dose equivalents;
phantoms
CUNHA, J.S.; SANTOS, W.S.; CARVALHO JUNIOR, A.B.
Conversion Coefficients of equivalent and effective doses in terms of air kerma for computational scenarios of Total Body Irradiation in lying-down patients.
Radiation Physics and Chemistry,
v. 159,
p. 138-146,
2019.
DOI:
10.1016/j.radphyschem.2019.02.051.
Disponível em: http://repositorio.ipen.br/handle/123456789/29966. 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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✔ 95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o
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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,
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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.