Volume 56, Number 2, April-June 2021
|Page(s)||93 - 101|
|Published online||11 March 2021|
Evaluation of neutron spectra and dose equivalent from a Varian 2100C/D Medical Linear Accelerator: Monte Carlo simulation and a literature review
University of Birjand, Physics Department, Faculty of Sciences,
* Corresponding author: firstname.lastname@example.org
Accepted: 10 February 2021
In this study was carried out a review according to experimental and Monte Carlo studies in the literature on the neutron production from 18 MV, Varian 2100C/D linac. The effects of these neutrons were investigated on the total fluence, the energy spectra, and the dose equivalent. These factors were calculated as a function of depth and the radiation field size by simulation of linac head using of MCNPX2.6.0 code. The neutron strength was found equal to 1.23 × 1012 nGy−1.The results showed that with increasing the field size from 5 × 5 to 40 × 40 cm2, the neutron fluence and dose equivalent in the water phantom rose to the maximum value for 25 × 25 cm2 field (3.05 × 107 ncm−2Gy−1 and 3.14 mSvGy−1 respectively) and then decreased with increasing the field size. According to the results, the magnetite-steel, ordinary, and limonite-steel concrete walls significantly increased the neutron dose equivalent for about 27.4%, 17.2%, and 13.5%, respectively.
Key words: Varian 2100C/D Linac / neutron fluence / radiation field size / Monte Carlo simulation
© SFRP, 2021
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