種々の大きさのCsI(Tl)シンチレーション検出器のγ線に対するスペクトル―線量変換演算子 (G(E) 関数) の計算と評価

概要

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The spectrum-dose conversion operators (hereafter, G(E) function) were calculated for CsI(Tl) scintillation counters based on the response functions obtained by a Monte Carlo simulation code, MCNP5, in the photon energy range from 40 to 10,000 keV. The G(E) functions were determined in the cases of crystal sizes 5.5 × 5.5 × 5.5, 10 × 10 × 10, 13 × 13 × 20 and 38 × 38 × 25 mm3 for ambient dose, H*(10). It was found that the values of H*(10) deduced from the pulse-height spectra and the G(E) function agreed with those of H*(10) evaluated in the calibration field in Japan Atomic Energy Agency (JAEA) within 2% in the case of irradiations by 137Cs, 226Ra and 60Co source, by the measurements using a scintillation counter whose crystal size was 13 × 13 × 20 mm3.