CAJ | 학술논문

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。
위해결기우 Si‐PIN 탐측기적전통계수형입자측량계통재측량저강도맥충복사장시존재적계수솔저화불능직접측량입자시간신식적문제，제출료전류형계수측량방법。기원리시대전류형 Si‐PIN 탐측기재입자입사시수출적맥충신호진행선성방대화고속수자화，병사용수자신호처리산법진행수거분석이획득입자측량신식。이용전류형 Si‐PIN 탐측기、전류형전치방대기화고대관수자시파기조건료전류형계수측량계통，병재241 Am‐244 Cm 화239 Pu 원상개전료α입자측량실험。실현료맥충폭도보화입자입사시간적연합측량，동시이용 FIR 급 IIR 형수자려파기개선료능보측량적능량분변솔。계통적최대계수솔체2×106 s －1，괄용우저강도맥충복사장측량。
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 was enhanced by FIR and IIR digital filters in data processing .The count rate is up to 2 × 106 s - 1 ,and the system is suitable for the measurement of low intensity pulsed radiation field .