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Radiation Protection Dosimetry Advance Access published online on June 14, 2007
Radiation Protection Dosimetry, doi:10.1093/rpd/ncm312
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

MULTILEAF SHIELDING DESIGN AGAINST NEUTRONS PRODUCED BY MEDICAL LINEAR ACCELERATORS

W. F. Rebello1,2,*, A. X. Silva1 and A. Facure3

1 (PEN/COPPE–DNC/POLI)CT/UFRJ, Ilha do Fundão, PO Box 68509, 21945-970, Rio de Janeiro, RJ, Brazil
2 Instituto Militar de Engenharia, Praça General Tibúrcio, 80 Praia Vermelha, 22290-270, Rio de Janeiro, RJ, Brazil
3 Comissão Nacional de Energia Nuclear, R. Gal. Severiano 90, sala 405, 22294-900, Rio de Janeiro, RJ, Brazil

* Corresponding author: rebello{at}ime.eb.br

Received May 22, 2006, amended April 24, 2007, accepted April 25, 2007

This work aims at presenting a study using Monte Carlo simulation of a Multileaf Shielding (MLS) System designed to be used for the protection of patients who undergo radiotherapy treatment, against undesired exposure to neutrons produced in the components of the medical linear accelerator heads. The choice of radiotherapy equipment as the subject of study fell on the Varian Clinac 2100/2300 with MLC-120 operating at 18 MeV. The general purpose Monte Carlo N-Particle radiation transport code, MCNP5, was used in the computer simulation in order to determine the ambient dose equivalent, H* (10), on several points on the patient's plane, with the equipment operation with and without the MLS. The results of the simulations showed a significant neutron dose reduction after the inclusion of the proposed shielding.


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