Monte Carlo法を用いた体内散乱線の解析 : ^<60>Coγ線照射時の平均質量エネルギー吸収係数比

概要

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In this paper, photon spectra in an irradiated body for the ^<60>Co γ-ray has been calculated by means of the Monte Carlo simulation, and using this spectra data, the ratios of the average mass energy-absorption coefficients (μ^^-_<en>/ρ)_<med,air> for each field size and for each depth were calculated. (μ^^-_<en>/ρ)_<med,air>, which has been obtained in this paper, varied with the field size and depth, and deviated from (μ^^-_<en>/ρ)_<med,air>, which AAPM showed as being the constant, with the maximum difference being 0.84%. Cλ', which has been calculated using (μ^^-_<en>/ρ)_<med,air> in this paper and average mass restricted stopping power ratios (L^^-/ρ)_<med,air> shown in previous paper, deviated from Cλ', which has been calculated using (μ^^-_<en>/ρ)_<med,air> and (L^^-/ρ)_<med,air> shown in the AAPM protocol, with the maximum difference being 1%.
公益社団法人日本放射線技術学会の論文
1989-09-01