基于探测晶体中^(138)La本征复合峰的海水γ能谱稳谱方法  

Utilizing the Complex Peak Generated by^(138)La in Detection Crystals for Stabilizing the γ-Spectrum in Seawater

作　　者：王震涛 王海军 张凯 桑文娟 杨翊方 WANG Zhentao;WANG Haijun;ZHANG Kai;SANG Wenjuan;YANG Yifang(Naval Medical Center P.L.A.,Shanghai 200433)

机构地区：[1]海军特色医学中心,上海200433

出　　处：《核电子学与探测技术》2024年第6期1026-1033,共8页Nuclear Electronics & Detection Technology

摘　　要：针对海水就地γ能谱测量中存在的谱漂问题,采用溴化镧探测器晶体内固有的^(138)La所发射的特征能量X/γ射线,在能谱上形成复合峰,通过计数系统控制复合峰的漂移实现全谱的稳峰,通过解决快速寻峰、确定复合峰净计数率和复合峰半高宽以及微电压控制等关键问题,建立基于^(138)La本征复合峰的稳谱技术,解决了水下γ能谱探测器入水后因温度骤降所致的特征峰漂移问题,并成功用于研制海水就地γ能谱测量系统。Aiming at the problem of spectral drift in the in situ seawater γ-spectrometry,the characteristic energy X/γ-rays emitted by ^(138)La inherent in the lanthanum bromide detector crystal are used to form characteristic peaks on the energy spectrum.The drift of the complex peak is controlled by the counting system to achieve the peak stabilization of the whole spectrum.By solving the key problems of rapid peak search,determining the net count rate of composite peaks and the half height and width of composite peaks,and micro-voltage control,the spectrum stabilization technology based on ^(138)La composite peaks is established.It has been successfully used in the development of in situ gamma spectrum measurement system for seawater.

关 键 词：水下 Γ能谱 溴化镧 温度效应 谱漂 稳谱 

分 类 号：X837[环境科学与工程—环境工程]