袖珍式BGO晶体伽马辐射仪的研制

Development of Pocket-sized Gamma Radiometer with BGO crystal

采用一体化理念设计了一款袖珍式伽马辐射仪,外壳采用ABS(苯乙烯、丁二烯、丙烯腈三元共聚物树脂)加PC(聚碳酸酯)材料组成,整机轻盈便携,通过TYPE-C标准接口兼顾数据通信和充电功能。介绍了仪器探测器选型和设计、主控系统设计和外围功能模块设计。通过高精度高阻抗运放和极零相消电路增强了信号输入响应,提高了信噪比。采用单节26650型钴酸锂电池为系统供电,通过设计高精度电压检测电路和延迟保护电路,实现电池充电回路或放电回路的正常运转,使得仪器可以连续工作48 h。仪器采用BGO晶体+SiPM组合作为辐射探测器,具有体积小、功耗低和探测效率高的特点,可应用于多个领域辐射探测。通过用计量站标准体源模型标定,仪器主要技术指标完全符合JJG(军工)29—2012检定规程要求。

A pocket-sized gamma radiometer is designed with the concept of integration.The shell is made of ABS and PC materials,the whole machine is light and portable with data communication and electricity charging through TYPE-C standard interface.This paper introduced the detector selection and the design of whole instrument,main control system and peripheral function modules.Through high-precision and high impedance operational amplifier and pole zero cancellation circuit,the signal input response is enhanced and the signal-to-noise ratio is improved.A single 26650 lithium cobaltate battery is used to supply power to the system.Through the design of high precision voltage detection circuit and delay protection circuit,the normal operation of battery charging circuit or discharge circuit is realized,so that the instrument can work continuously for 48 hours.The instrument adopts BGO crystal+SiPM combination as radiation detector,which has the characteristics of small volume,low power consumption and high detection efficiency.It can be applied to radiation detection in many fields.Through the calibration of the standard volume source model of the metering station,the main technical indexes of the instrument were tested,which fully met the requirements of JJG(military industry)29-2012 verification regulations.