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Radiation Protection Dosimetry 108:85-89 (2004)
© 2004 © Oxford University Press 2004; all rights reserved

Scientific Note

The validation of organ dose calculations using voxel phantoms and Monte Carlo methods applied to point and water immersion sources

J. G. Hunt*, F. C. A. da Silva, C. L. P. Mauricio and D. S. dos Santos

Institute of Radiation Protection and Dosimetry, Av. Salvador Allende s/n, Recreio, Rio de Janeiro, CEP 22780 160, Brazil

* Corresponding author: john{at}ird.gov.br

The Monte Carlo program ‘Visual Monte Carlo-dose calculation’ (VMC-dc) uses a voxel phantom to simulate the body organs and tissues, transports photons through this phantom and reports the absorbed dose received by each organ and tissue relevant to the calculation of effective dose as defined in ICRP Publication 60. This paper shows the validation of VMC-dc by comparison with EGSnrc and with a physical phantom containing TLDs. The validation of VMC-dc by comparison with EGSnrc was made for a collimated beam of 0.662 MeV photons irradiating a cube of water. For the validation by comparison with the physical phantom, the case considered was a whole body irradiation with a point 137Cs source placed at a distance of 1 m from the thorax of an Alderson–RANDO phantom. The validation results show good agreement for the doses obtained using VMC-dc and EGSnrc calculations, and from VMC-dc and TLD measurements. The program VMC-dc was then applied to the calculation of doses due to immersion in water containing gamma emitters. The dose conversion coefficients for water immersion are compared with their equivalents in the literature.


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