土壤样品总β测量的探测效率校正因子检验

Verification of Counting Efficiency Correction Factor of the Measurement of Global beta Radioactivity in Soil Sample

采用两种不同的实验方法 ,检验环境土壤样品总 β测量中探测效率校正因子的适用性。对同一批土壤样品用 γ能谱法测量其 2 38U、2 32 Th、2 2 6Ra和 4 0 K的放射性核素含量 ,计算出样品中的总 β含量( C( β) 算 ) ;再用核物理实验方法直接测出样品中的总 β含量 ( C( β) 测 ) ,探测效率校正因子 K=C( β) 测 /C( β) 算 。实验结果表明 ,本实验得出的效率校正因子 K值与文献 [1]用标准样品得出的完全一致 ,均为0 .77;

Two different experimental methods are used to verify the applicability of counting efficiency correction factor in the global beta radioactivity measurement of environmental soil sample. For the same foil sample, the amount of radioactive nuclide 238 U, 232 Th, 226 Ra, 40 K is measured respectively by γ ray spectrometer, the global beta radioactivity of the sample is calculated ( C (β) calculate ), and then measured directly by chemical method ( C (β) measure ). Counting efficiency correction factor K = C (β) calculate / C (β) measure . The result shows that K gotten in this experiment is accordant with that by standard sample [1] , all they are 0.77. The same result is gotten for littoral area soil.