Abstract
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 cm2field (3.05 × 107 ncm−2Gy−1and 3.14 mSvGy−1respectively) 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.
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