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CC BY-NC-ND 4.0 · World J Nucl Med 2017; 16(02): 114-121
DOI: 10.4103/1450-1147.203065
Original article

Specific absorbed fractions of internal photon and electron emitters in a human voxel-based phantom: A monte carlo study

Ruhollah Ghahraman Asl
Bioinformatics Research Centre, Department of Nutrition and Biochemistry, Faculty of Medicine, Sabzevar University of Medical Sciences, Sabzevar
,
Ali Parach
1   Department of Medical Physics, Faculty of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd
,
Shahrokh Nasseri
2   Department of Medical Physics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad
,
Mehdi Momennezhad
2   Department of Medical Physics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad
,
Seyed Zakavi
3   Nuclear Medicine Research Center, Mashhad University of Medical Sciences, Mashhad
,
Hamid Sadoughi
4   Department of Biotechnology and Molecular Sciences, Faculty of Medicine, North Khorasan University of Medical Sciences, Bojnurd
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The specific absorbed fraction (SAF) of energy is an essential element of internal dose assessment. Here reported a set of SAFs calculated for selected organs of a human voxel-based phantom. The Monte Carlo transport code GATE version 6.1 was used to simulate monoenergetic photons and electrons with energies ranging from 10 keV to 2 MeV. The particles were emitted from three source organs: kidneys, liver, and spleen. SAFs were calculated for three target regions in the body (kidneys, liver, and spleen) and compared with the results obtained using the MCNP4B and GATE/GEANT4 Monte Carlo codes. For most photon energies, the self-irradiation is higher, and the cross-irradiation is lower in the GATE results compared to the MCNP4B. The results show generally good agreement for photons and high-energy electrons with discrepancies within − 2% ±3%. Nevertheless, significant differences were found for cross-irradiation of photons of lower energy and electrons of higher energy due to statistical uncertainties larger than 10%. The comparisons of the SAF values for the human voxel phantom do not show significant differences, and the results also demonstrated the usefulness and applicability of GATE Monte Carlo package for voxel level dose calculations in nonuniform media. The present SAFs calculation for the Zubal voxel phantom is validated by the intercomparison of the results obtained by other Monte Carlo codes.

Keywords

GATE calculation - internal dosimetry - phantom - specific absorbed fraction value


Publication History

Article published online:
18 May 2022

© 2017. Sociedade Brasileira de Neurocirurgia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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