基于HPGeγ谱仪的土壤样品分析

摘要

The activities of226Ra,232Th, 40K, 238 U in soil sample were measured by wide energy HPGe gamma -ray spectrometer, the source -free efficiency calibration method and relative measurement method were presented. The results show that the analysis date of the two methods is consistent. On no standard volume source or on - site measurement condition, the source - free efficiency calibration method is a ideal choice for system efficiency calibration.%使用宽能超低本底HPGeγ谱仪,分别采用无源效率刻度曲线法和相对测量比较法对土壤样品中226 Ra、232Th、40K、238U的放射性活度进行了测量.通过对计算结果的对比分析得出:在150 keV以上的中高能区无源效率刻度方法与传统相对比较法对相同样品的测量分析结果具有很好的一致性,在无标准源可依或现场测量分析等情况下,无源效率刻度方法是一种比较理想的效率刻度方法.