利用航空模型源刻度车载NaI γ谱仪系统

Calibration of Vehicular Na I Spectrometer by Use of Aviation Model

利用车载Na I(Tl)γ谱仪系统进行巡测之前须进行效率刻度,由于巡测特点刻度需使用大体积源,且系统体积庞大不便进入实验室。因此,传统的实验室γ谱仪刻度方法不适用于该系统。文中对采用的系统进行了介绍,对刻度的方法原理作了描述,并利用航空模型源进行了效率刻度和验证,验证结果表明效率刻度误差小于10%,最后对效率刻度不确定度来源作了分析。

The Na I（ Tl） spectrometer system needs efficiency calibration before to be used,and the efficiency calibration requires large volume source due to the characteristics of survey. The spectrometer system can not enter the lab because of the large volume. Therefore,the traditional calibration method does not apply to the spectrometer system. In this paper,the spectrometer system is presented,the principles and methods of efficiency calibration and the efficiency calibration by use of aviation model source are described. The verification results show that the efficiency calibration error is less than 10%. The uncertainty of the efficiency calibration has been analyzed.