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Computational and Mathematical Methods in Medicine
Volume 2017, Article ID 3621631, 8 pages
Research Article

A Monte Carlo Study of the Photon Spectrum due to the Different Materials Used in the Construction of Flattening Filters of LINAC

1Universidad Nacional de Costa Rica (UNA), Avenida 1, Calle 9, Apartado Postal 86-3000, Heredia, Costa Rica
2Universidad Pedagógica y Tecnológica de Colombia, Boyacá, Colombia
3Clínica Cancerológica de Boyacá, Tunja, Colombia

Correspondence should be addressed to S. A. Martinez-Ovalle; oc.ude.ctpu@zenitram.nitsuga.s

Received 10 February 2017; Accepted 14 May 2017; Published 10 July 2017

Academic Editor: Thanapong Chaichana

Copyright © 2017 J. S. Estepa Jiménez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Different types the spectrum of photons were studied; they were emitted from the flattening filter of a LINAC Varian 2100 C/D that operates at 15 MV. The simplified geometry of the LINAC head was calculated using the MCNPX code based on the studies of the materials of the flattening filter, namely, SST, W, Pb, Fe, Ta, Al, and Cu. These materials were replaced in the flattening filter to calculate the photon spectra at the output of this device to obtain the spectrum that makes an impact with the patient. The different spectra obtained were analyzed and compared to the emission from the original spectra configuration of the LINAC, which uses material W. In the study, different combinations of materials were considered in order to establish differences between the use of different materials and the original material, with the objective of establishing advantages and disadvantages from a clinical standpoint.