Title: Simulation of the Mg(Ar) Ionization Chamber Currents by Different Monte Carlo Codes in Benchmark Gamma Fields
Authors: LIN Yi-ChunLIU Yuan-HaoNIEVAART SanderCHEN Yen-FuWU Shu-WeiCHOU Wen-TsaeJIANG Shiang-Huei
Citation: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT vol. 652 no. 1 p. 559-563
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2011
JRC N°: JRC62556
ISSN: 0168-9002
URI: www.elsevier.com/locate/nima
http://publications.jrc.ec.europa.eu/repository/handle/JRC62556
DOI: 10.1016/j.nima.2010.11.182
Type: Articles in Journals
Abstract: High energy photon (over 10 MeV) and neutron beams adopted in radiobiology and radiotherapy always produce mixed neutron/gamma-ray fields. The Mg(Ar) ionization chambers are commonly applied to determine the gamma-ray dose because of its neutron insensitive characteristic. Nowadays, many perturbation corrections for accurate dose estimation and lots of treatment planning systems are based on Monte Carlo technique. The Monte Carlo codes EGSnrc, FLUKA, GEANT4, MCNP5, and MCNPX were used to evaluate energy dependent response functions of the Exradin M2 Mg(Ar) ionization chamber to a parallel photon beam with mono-energies from 20 KeV to 20 MeV. For the sake of validation, measurements were carefully performed in well-defined (a) primary M-100 X-ray calibration filed, (b) primary 60Co calibration beam, (c) 6-MV and (d) 10-MW therapeutic beams in hospiital. At energy region below 100 KeV, MCNP5 and MCNPX both had lower responses than other codes. For energies above 1 MeV, the MCNP ITS-mode greatly resembled other three codes and the differences were within 5%. Comparing to the measured currents, MCNP5 and MCNPX using ITS-mode had perfect agreement with the Co-60, and 10-MV beams. But at X-ray energy region, the derivations reached 17%. This work shows us a better insight into the performance of different Monte Carlo codes in photon-electron transport calculation. Regarding the application of the mixed field dosimetry like BNCT, MCNP with ITS mode is recognized as the most suitable tool by this work.
JRC Institute:Institute for Transuranium Elements

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