HPGe伽马谱仪测量环境样品的效率刻度方法  

The Efficiency Calibration Methods in Measuring Environmental Samples by HPGe Gamma Spectrometer

作　　者：邓海军[1] 赖万昌[1] 甘霖[1] 文湘闽[2] 贺良国[2] 

机构地区：[1]成都理工大学核技术与自动化工程学院,四川成都610059 [2]四川省疾病预防控制中心职业辐射与卫生所,四川成都610041

出　　处：《核电子学与探测技术》2014年第11期1283-1286,共4页Nuclear Electronics & Detection Technology

基　　金：高精度伽马能谱仪研发(项目编号:2012AA06180303)

摘　　要：针对环境样品天然放射性核素分析中,伽马谱仪对238U、235U等发射低能特征γ射线(<200ke V)核素的测量准确性较差问题,运用灵活性强、适用范围广的无源效率刻度方法。考虑样品的吸收衰减、特征峰本底扣除、样品盒几何尺寸等因素的影响,使实验结果的准确度得到了较大的提高,最大相对偏差<8.0%。The poor measurement accuracy of ^238 U and ^235U which emit low- energy gamma rays（ 200 ke V）are existed in natural radioactive nuclide analysis in environmental samples using gamma spectrometer. In this paper,the accuracy of the obtained experimental results were improved significantly with the maximum relative error〈 8. 0% by using strong flexibility,wide applicable source- less efficiency calibration method,and considering the influence of various factors such as the absorption attenuation,the background deduct of characteristic peak and the geometry size of sample box.

关 键 词：低能光子 探测效率 MCNP5 无源效率刻度 

分 类 号：TL817[核科学技术—核技术及应用]