针对现场快速测量放射性污染的需要,设计开发了一种基于离子注入硅半导体探测器(PIPS)的便携式α谱仪.将PIPS探测器捕获的α射线通过电荷灵敏前置放大器、信号获取模块实现谱数据获取和处理,以C8051F120单片机为主控平台进行谱线分析,以矩阵键盘、LCD组建人机接口,采用锂离子电池及电源模块供电;设计了真空测量腔以得到能量分辨率更高、更干净的谱线.性能测试表明,仪器整机功耗为105 mA、在空气环境下能量分辨率为8.1%、在真空环境下能量分辨率为6.7%.该仪器具有精度高、稳定性好、低功耗、适于现场测量等特点.%In order to maintain the needs of determining radiation contamination in - situ rapidly, we established a kind of portable alpha - ray spectrometer based on the PIPS detector. The instrument employs PIPS detector to capture α- ray, signals are collected and disposed by preamplifier circuit and the signal acquisition module,then spectra analysis is achieved by C8051F120 MCU control platform. Man- machine interface was organizedby matrix keyboard and LCD display. Both lithium - ion batteries and power processing module were used to supply the system power. We designed a vacuum measurement chamber in order to obtain higher energy resolution and cleaner spectra. By performance testing we get that the whole power consumption of this instrument is 105mA, energy resolution is 8.1％ in normal air environment and 6.7％ in vacuum. The instrument has high- precision, good stability, low power consumption, and is very suitable for in - situ measuring.
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