放射性碘活度监测仪误报警问题的研究  

Research on Problem of Radioactive Iodine Activity Monitor False Alarm

作　　者：郭培斌[1] 

机构地区：[1]中核集团江苏核电有限公司,江苏连云港222042

出　　处：《核动力工程》2015年第3期114-116,共3页Nuclear Power Engineering

摘　　要：对放射性碘活度监测仪在核电厂调试期间出现的误报警问题进行分析。结果表明,仪表本底噪声、周围γ外辐射场和其他非测量核素统计在总计数中会引起测量值失真;若用131I探测效率计算131I^135I总放射性碘体积活度将引起测量结果失真。通过对放射性碘活度监测仪能量窗口设置区间合理性的分析论证,将测量能量窗口由100~2000 ke V改为310~410 ke V,仅监测131I,方案实施后仪表测量值准确,未再出现误报警。False alarm problem of radioactive iodine activity monitor during commissioning in nuclear plant is analyzed and studied. Results show that the instrument background noise, ambient gamma radiation field and other non nuclide measurement statistics will cause the measured value distortion; the using of the 1311 detecting efficiency to calculate the 1311 to 1351 total radioactive iodine volume activity will cause the distortion of the measured results. Through the analysis of the reasonability of the set area of the radioactive iodine monitor energy window, and to change the measurement window energy 100~2000 keV to 310- 410 keV, only 1311 is monitored. After the implementation of this prozram, the instrumentation values are accurate and nt~ false alarm ne.mlr~

关 键 词：碘活度监测仪 能谱图 半衰期 探测效率 

分 类 号：TL81[核科学技术—核技术及应用]