宽量程高速γ探测数据采集系统设计  

Design of Data Acquisition System for Wide-Range and High-Speed Gamma Detector

作　　者：李达 黄禄刚 谢民 刘永德 张照华 李多宏 LI Da;HUANG Lu-gang;XIE Min;LIU Yong-de;ZHANG Zhao-hua;LI Duo-hong(State Nuclear Security Technology Centre,Beijing 102401,China;Xi’an Huineng Electronic Equipment Co Ltd,Xi’an 710065,China;China National Nuclear Corporation,Beijing 100822,China)

机构地区：[1]国家核安保技术中心,北京102401 [2]西安汇能电子设备有限责任公司,西安710065 [3]中国核工业集团有限公司,北京100822

出　　处：《核电子学与探测技术》2020年第5期705-708,共4页Nuclear Electronics & Detection Technology

摘　　要：介绍了宽量程高速7探测数据采集系统的设计,该系统采用碘化钠晶体和光电倍增管构建的7探测器,负高压供电工作模式。在低辐射场时对脉冲进行计数,高辐射场则以检测脉冲占空比(PWM)技术纠正脉冲重叠的计数漏失。以内置硬件定时器和计数器的高速单片机对探测数据进行处理并通过UART接口向上位机发送数据。测试结果表明:在极低辐射场中,探测器具有极高的灵敏度;在周围剂量当量率不超过312μSv/h(^(137)CS)的辐射场中,探测器可用于准确测M辐射场强度;在周围剂最当量率高于312pSv/h(^(137)Cs)的辐射场中,探测器基PWM方法能够对现场态势给出正确的判断。It introduced the designing of a data acquisition system used for wide-range and highspeed gamma detector.The system use sodium iodide crystal and photomultiplier tube for gamma detector construction.It woks in negative high voltage state for power supply.It counts pulses when working in low radiation field and use PWM method to correct the counts loss due to pulse overlap when working in strong radiation field.The built-in hardware timer and high speed singlechip computer of the counter can process the detection data and send it to the upper computer through the UART interface.The test result shows that the detector has extremely high sensitivity when working in low radiation field,it can measure the radiation field intensity accurately when working in the radiation field with an ambient dose rate no more than 312^(^t)Sv/h(^(137)Cs).It use PWM method making a correct judgment to the scene situation when working in the radiation field with an ambient dose rate above 312μSv/h(^(137)Cs).

关 键 词：核辐射 Γ探测 单片机 数据传输协议 CRC32校验 

分 类 号：TL81[核科学技术—核技术及应用]