摘要
针对Ф75mm×25mm的土壤样品,利用HPGeγ谱仪,分别用241Am、137Cs、^(60)Co混合点源测量5种高度的样品剖面上不同位置的全能峰效率,确定点源全能峰效率随半径变化的函数关系,对该函数进行数值积分计算可以得到59.54keV、661.66keV、1173.2keV和1332.5keVγ射线的面源全能峰效率,进一步拟合确定面源全能峰效率随样品高度变化的函数参数,对样品高度进行数值积分计算得到Ф75mm×25mm样品的体源全能峰效率。结果表明,点源模拟计算的体源全能峰效率和标准体源全能峰效率进行比较,两者在10%以内符合。因此,在没有标准体源的情况下,用已知活度的标准点源模拟体源进行全能峰效率刻度的方法替代标准体源进行效率刻度方法是可行的。
For Ф75 mm×25 mm sample,the full energy peak efficiencies on different heights of sample radius were obtained using the point sources,and the function parameters about the full energy peak efficiencies of point sources based on radius was fixed.The 59.54 keV γ-ray,661.66 keV γ-ray,1 173.2 keV γ-ray,1 332.5 keV γ-ray detection efficiencies on different height of samples were obtained,based on the full energy peak efficiencies of point sources and its height,and the function parameters about the full energy peak efficiencies of surface sources based on sample height was fixed.The detection efficiency of Ф75 mm×25 mm calibration source can be obtained by integrality,the detection efficiencies simulated by point sources are consistent with the results of stander source in 10%.Therefore,the calibration method of stander source can be substituted by the point source simulation method,and it is feasible when there is no stander source.
出处
《辐射防护》
CAS
CSCD
北大核心
2010年第5期294-299,共6页
Radiation Protection
关键词
点源模拟
面源全能峰效率
体源全能峰效率
Point Source Simulation
Full Energy Peak Efficiency of Surface Source
Full Energy Peak Efficiency of Stander Source
