基于NaI(Tl)γ能谱温漂修正方法研究  

Research on temperature peak-shift correction methods for NaI(Tl) gamma spectrum

作　　者：方登富[1] 韦应靖[1] 崔伟[1] 冯梅[1] 唐智辉 李志刚 以恒冠 FANG Dengfu;WEI Yingjing;CUI Wei;FENG Mei;TANG Zhihui;LI Zhigang;YI Hengguan(China Institute for Radiation Protection,Taiyuan 030006 China)

机构地区：[1]中国辐射防护研究院,山西太原030006

出　　处：《中国辐射卫生》2021年第1期19-23,33,共6页Chinese Journal of Radiological Health

摘　　要：目的探究NaI (Tl)γ谱仪的道址随环境温度变化的规律,通过60Co和152Eu能谱修正试验验证修正方法的可靠性。方法使用了2种稳谱方法,分别为曲线拟合的修正方法和已知测量峰值的修正方法。结果温度变化会对NaI(Tl)测量谱峰位产生影响,以25℃为参考温度,在5℃时相对峰位会向右偏移9.6%,在60℃向左偏移16%。两种修正方法都是基于温度变化引起的道址变化进行的修正,修正后的测量谱与参考测量谱峰位基本符合,验证了修正方法的可靠性。结论在现场监测时,为使测量谱信息准确可靠,建议对环境温度进行监控,以便进行相应的数据修正。Objective The experiment project was designed to explore the variation of NaI(Tl) gamma spectrometer channels with environmental temperature. 60 Co and 152 Eu were used to verify the reliability of the correction methods. Methods Two correction methods were applicated, which were curve fitting correction method and known measurement peak correction method. Results The experimental results showed that temperature changes had an effect on NaI(Tl) measured spectra peak. The relative peak will shift to the right at 5℃ by 9.6%, and to the left at 60℃ by 16%, with the reference temperature set at 25℃. The two methods are based on the channel change due to temperature changes, and they could effectively correct the temperature peak-drift. Conclusion In order to make the measured spectrum information accurate and reliable in field monitoring, it is suggested to monitor the environmental temperature so as to correct the measured data.

关 键 词：NAI(TL)探测器 测量能谱 温漂修正 全能峰 

分 类 号：TL81[核科学技术—核技术及应用]