连续监控燃料元件的完整性是保证反应堆安全运行和人员辐射安全的重要措施之一。介绍一种便携式γ谱仪的研制情况，用于主冷却剂中放射性核素的现场识别及其活度浓度的监测分析。采用铝合金材料包裹1"×1"的LaBr3晶体、CR173型光电倍增管和前置放大器作为探测器。脉冲信号经线性放大器和AD变换后进入以FPGA为核心的数字化多道系统，再用ARM嵌入式系统完成能谱数据的读取、分析处理和人机交互。测试结果表明，该便携式谱仪的主要指标能够初步满足一回路水现场监测的需求。
Continuous monitoring the integrity of fuel element is very important to maintain the pressurized-water reactor running safely and keep personnel out of nuclear radiation. A portable gamma-ray spectrometer is developed and applied for radionuclides identification in situ and detecting their activity concentration in primary coolant. The detector consists of a 1"×1" LaBr3 scintillation crystal, connected with a CR173 typed photomultiplier, a preamplifier and power supply, and aluminum alloy is chosen for the watertight cylindrical enclosure. The pulse signal was amplified and AD converted firstly, and then transmitted to the digital multi-channel analyzer taking FPGA as core. The spectrum data was read and analyzed by the ARM system, so was the human machine interaction. Experimental results show that the main index of this portable gamma-ray spectrometer can meet the needs of in situ monitoring the integrity of fuel element.
2016,38(10): 142-144 收稿日期：2016-8-26
DOI：10.3404/j.issn.1672-7619.2016.10.029
分类号：TL817+.2;TL812+.1
作者简介：李晓旭(1978-),男,硕士研究生,工程师,研究方向为核生化监测与防护。
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