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Radiation Protection Dosimetry 2004 111(1):9-12; doi:10.1093/rpd/nch351
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Radiation Protection Dosimetry Vol. 111, No. 1 © Oxford University Press 2004; all rights reserved

Calculation of conversion coefficients for clinical photon spectra using the MCNP code

M. A. F. Lima1, A. X. Silva2,* and V. R. Crispim2

1 PEN/COPPE/CT/UFRJ, Universidade Federal do Rio de Janeiro, 21945-970—Ilha do Fundão—Caixa Postal 68509, Rio de Janeiro, RJ, Brazil
2 [PEN/COPPE—DNC/EE] CT/UFRJ, Universidade Federal do Rio de Janeiro, 21945-970—Ilha do Fundão—Caixa Postal 68509, Rio de Janeiro, RJ, Brazil

* Corresponding author: ademir{at}con.ufrj.br

In this work, the MCNP4B code has been employed to calculate conversion coefficients from air kerma to the ambient dose equivalent, H*(10)/Ka, for monoenergetic photon energies from 10 keV to 50 MeV, assuming the kerma approximation. Also estimated are the H*(10)/Ka for photon beams produced by linear accelerators, such as Clinac-4 and Clinac-2500, after transmission through primary barriers of radiotherapy treatment rooms. The results for the conversion coefficients for monoenergetic photon energies, with statistical uncertainty <2%, are compared with those in ICRP publication 74 and good agreements were obtained. The conversion coefficients calculated for real clinic spectra transmitted through walls of concrete of 1, 1.5 and 2 m thick, are in the range of 1.06–1.12 Sv Gy–1.


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