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Radiation Protection Dosimetry Advance Access originally published online on June 30, 2006
Radiation Protection Dosimetry 2007 123(1):56-61; doi:10.1093/rpd/ncl080
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Monte Carlo simulation of scattered and thermal photoneutron fluences inside a radiotherapy room

A. Facure1,*, A. X. Da Silva2 and R. C. Falcão1

1 Comissão Nacional de Energia Nuclear, R. Gal. Severiano 90, sala 405, Rio de Janeiro, RJ 22294-900, Brazil
2 [PEN/COPPE—DNC/EE]CT/UFRJ, Ilha do Fundão, PO Box 68509, Rio de Janeiro, RJ 21945-970, Brazil

* Corresponding author: afacure{at}cnen.gov.br

Received November 1, 2005, amended March 26, 2006, accepted May 29, 2006


  Abstract

In this work, the behaviour of scattered and thermal photoneutron fluences in a radiotherapy treatment room was investigated by means of Monte Carlo simulation. The MCNP code was used to study the dependence of these neutron fluences on room design, room area and the effect of neutron moderator materials placed on the room walls. The results of the investigation showed a poor agreement between the simulations and empirical approximations, suggesting that the formulae found in the literature can underestimate the neutron flux inside a radiotherapy room.


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