基于Si-PIN探测器的电流型计数式α粒子测量  

Current-mode-counting Measurement ofα-particle with Si-PIN Detector

作　　者：田耕[1] 欧阳晓平[1] 刘金良[1] 李海涛[1] 张显鹏[1,2] 渠红光[1] 

机构地区：[1]西北核技术研究所,陕西西安710024 [2]西安交通大学核科学与技术学院,陕西西安710049

出　　处：《原子能科学技术》2015年第9期1678-1684,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11305129)

摘　　要：为解决基于Si-PIN探测器的传统计数型粒子测量系统在测量低强度脉冲辐射场时存在的计数率低和不能直接测量粒子时间信息的问题,提出了电流型计数测量方法。其原理是对电流型Si-PIN探测器在粒子入射时输出的脉冲信号进行线性放大和高速数字化,并使用数字信号处理算法进行数据分析以获得粒子测量信息。利用电流型Si-PIN探测器、电流型前置放大器和高带宽数字示波器组建了电流型计数测量系统,并在241 Am-244 Cm和239 Pu源上开展了α粒子测量实验。实现了脉冲幅度谱和粒子入射时间的联合测量,同时利用FIR及IIR型数字滤波器改善了能谱测量的能量分辨率。系统的最大计数率达2×106 s-1,适用于低强度脉冲辐射场测量。The current‐mode‐counting measurement method was proposed to overcome the shortcomings of traditional counting system with Si‐PIN detector such as relatively low count rate and the inconvenience of time information measurement of particles in low intensity pulsed radiation measurement .In the method ,the pulse generated by Si‐PIN detector as induced by incident particle was amplified linearly and then digitized at high speed ,and the spectrum was acquired by digital signal processing algorithms with the waveform data . The current‐mode‐counting measurement system was developed with Si‐PIN detector ,current‐sensitive preamplifier and wideband digital oscilloscope . Experiments were carried out with 241 Am‐244 Cm and 239 Pu sources ,and spectra and time distributions of incident α‐particles were acquired .The energy resolution of spectra wasenhanced by FIR and IIR digital filters in data processing .The count rate is up to 2 ×10^6 s - 1 ,and the system is suitable for the measurement of low intensity pulsed radiation field .

关 键 词：Si—PIN 电流型计数 α粒子测量 数字滤波器 脉冲辐射场 

分 类 号：O571.53[理学—粒子物理与原子核物理] TN152[理学—物理]