常用39种核素空气比释动能率常数计算  

The air kerma rate constants of 39 nuclides is commonly calculated

作　　者：段嘉宇 王川 黄政林 唐智辉 方登富[1] 李志刚 王弘昱 DUAN Jiayu;WANG Chuan;HUANG Zhenlin;TANG Zhihui;FANG Dengfu;LI Zhigang;WANG Hongyu(China Institute for Radiation Protection,Taiyuan,030006;Shanxi Key Provincial Key Laboratory for Radiation Safety and Protection,Taiyuan,030006;Key Laboratory of Radiation Protection Technology of CNNC,Taiyuan,030006;Nuclear Power Operations Research Institute,Shanghai,200126)

机构地区：[1]中国辐射防护研究院,太原030006 [2]辐射安全与防护山西省重点实验室,太原030006 [3]中核集团辐射防护技术重点实验室,太原030006 [4]核电运行研究(上海)有限公司,上海200126

出　　处：《核电子学与探测技术》2025年第1期47-53,共7页Nuclear Electronics & Detection Technology

摘　　要：核素空气比释动能率常数Γ_(a)是评估剂量和屏蔽计算中非常重要的数据,Γ_(a)的计算需要用到通量到空气比释动能率的转换系数K_(a)/Φ以及核素衰变光子信息。2020年国际辐射与测量委员会ICRU发布了95号报告,该报告推荐了新的K_(a)/Φ。为了验证基础数据更新后核素Γ_(a)数值的变化,基于理论和蒙特卡洛方法对医学、工业、农业中常用的39种核素空气比释动能率常数进行了计算,并对不同插值方法及阈值选取做了对比分析。得到以下结论:三次样条、对数-对数拉格朗日插值、线性-对数拉格朗日插值方法对Γ_(a)的计算影响较小;阈值选取对Γ_(a)的计算非常重要,部分核素在不同阈值情况下计算差异较大,推荐核医学剂量估算使用10 keV阈值,其他情况阈值选取20 keV;理论计算和MCNP模拟计算差异较小,都可用于常数的计算。The radionuclide air kerma rate constant(Γ_(a)).Γ_(a)is a very important data in dose evaluation and shielding calculation,which requires the conversion coefficient of flux to air Kerma(K_(a)/Φ)and the information of nuclide decay photon.In 2020,the International Commission on Radiation and Measurements(ICRU)released Report 95(Operational Quantities for External Radiation Exposure),which recommended a new K_(a)/Φ.In order to verify the change in nuclide values after the basic data was updated.Based on the theory and Monte Carlo method,the air specific kinetic energy rate constants of 39kinds of nuclides commonly used in medicine,industry and agriculture were calculated,and different interpolation methods and threshold selection were compared and analyzed.The cubic splines,logarithmic-logarithmic Lagrangian interpolation,and linear-logarithmic Lagrangian interpolation interpolation methods have little influence on the calculation ofΓ_(a).The calculation ofΓ_(a)threshold selection pairs is very important,and the calculation of some nuclides with different thresholds is quite different,and the recommended nuclear medicine dose estimation is recommended to use a threshold of10 keV,and the threshold of other cases is 20 keV.The difference between theoretical calculation and MCNP simulation calculation is small,and both can be used for constants calculation.

关 键 词：空气比释动能率常数 空气比释动能 转换系数 

分 类 号：X825[环境科学与工程—环境工程]