摘要
介绍了采用固定阈值脉宽法识别常见核素的方法。该方法基于放大器输出的脉冲信号相对固定阈值的脉宽与信号幅度存在的对数对应关系,应用时间数字转换装置,测量核辐射脉冲信号固定阈值脉宽值并累积,得到能量经对数压缩过的能谱,并可由此能谱中的特征峰识别常见核素。利用NaI(Tl)闪烁体探测器测试^(241)Am、^(131)I、^(137)Cs、^(60)Co等γ源,测试结果表明:相对于常见的基于ADC的能谱测量,固定阈值脉宽法具有电路简单、灵活、能量响应范围宽的优点。
The method of identifying common nuclides using fixed threshold pulse width method is introduced.Based on the logarithmic correspondence between the signal amplitude and the amplifier output signal pulse width which relative to the fixed threshold.The time digital conversion device is used to measure the fixed threshold pulse width value of the nuclear radiation pulse signal and accumulate it,The energy spectrum with logarithmic compression is obtained,from which common nuclides can be identified.TestγSource of^(241)Am,^(131)I,^(137)Cs,^(60)Co with NaI(Tl)scintillator detector,Compared with the common ADC based energy spectrum measurement,The results show that the fixed threshold pulse width method has the advantages of simple circuit,flexibility,wide energy response range.
作者
杨大战
杨斌
李钢
周冬亮
闫海霞
李宝昌
高玮辰
李岩
YANG Da-zhan;YANG Bin;LI Gang;ZHOU Dong-liang;YAN Hai-xia;LI Bao-chang;GAO Wei-chen;LI Yan(Heilongjiang Institute of Atomic Energy,Harbin 150081,China)
出处
《核电子学与探测技术》
CAS
北大核心
2023年第1期209-212,共4页
Nuclear Electronics & Detection Technology
基金
黑龙江省应用技术研究与开发计划项目(GA20C011)
黑龙江省科学院中试与熟化项目(ZSSH2022YZN01)资助
关键词
固定阈值
脉宽
核素识别
fixed threshold
pulse width
nuclide identification
