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本文旨在通过蒙特卡罗(MC)理论模拟计算方法来确定地面放射性测量模型标准(Y系列模型体源)表面中心点上方不同高度的剂量率/比释动能率,为将我国地面放射性测量模型标准转化为环境电离辐射模型体源标准提供理论依据。在建立MC数学理论模型的基础上,采用MCNP模拟计算软件计算Y系列模型体源表面中心点上方不同高度的空气吸收剂量率/空气比释动能率,由此,拟合出了能客观反映我国模型体源表面上方单位放射性核素含量的空气吸收剂量率/空气比释动能率,并对其计算结果与其它实验方法实测的结果(G(E)函数法、高气压电离室法、TLD法)进行了比对,比对结果在10%内符合;同时对其计算结果的不确定度进行了评定,其合成标准不确定度为3.0%。
The aim of this paper is to determine the dose rate / specific energy at different heights above the center point of the surface radioactivity measurement model standard (Y-series model body source) by means of Monte Carlo (MC) theoretical simulation calculation. In order to integrate the terrestrial radioactivity measurement model Standard conversion to environmental ionizing radiation source body model to provide a theoretical basis. Based on the mathematical model of MC, MCNP simulation software was used to calculate the air dose rate / air kerma ratio at different heights above the center point of the Y-series model body surface. Thus, The ratio of air absorbed dose / air kerma per unit radionuclide content above the bulk source surface of the model was calculated and compared with the results of other experimental methods (G (E) function method, high pressure ionization chamber method, TLD method ) Were compared, the results of the comparisons were within 10%; the uncertainty of the calculation results was also evaluated, and the synthetic standard uncertainty was 3.0%.