| XH-3130A在线液体γ监测仪探测效率MC模拟 |
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| 引用本文： | 李明旭,雷鸣.XH-3130A在线液体γ监测仪探测效率MC模拟[J].强激光与粒子束,2017,29(12):126010. |
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| 作者姓名： | 李明旭 雷鸣 |
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| 作者单位： | 1.中核集团 西安核仪器厂, 西安 71 0061 ; |
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| 摘 要： | 为了研究改造后的XH-3130A在线液体伽马监测仪对核电站某管道一次水放射性核素的探测效率及探测限的影响因素，利用MCNP5程序计算了改造前后XH-3130A伽马监测仪对管道放射性源项伽马能量在0.08~1.5 MeV范围全谱区及特征峰区活度浓度探测效率。针对放射性管道中单一核素Cs-137，计算结果与液体放射性源标定计数刻度实验数据符合较好。并分析了不同源项伽马能量及探头布置等因素对活度浓度探测效率大小影响差异。模拟结果表明，改造后的XH-3130A在线液体伽马监测仪不再影响原有测量管道整体性且最低探测限为1.35103 Bq/m3，可以满足工程技术要求。
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| 关 键 词： | 液体伽马监测仪 探测效率 活度浓度 MCNP5 探测限 |
| 收稿时间： | 2017-06-21 |
Simulation of detector efficiency for online liquid gamma monitor XH-3130A with MCNP |
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| Institution: | 1.Xi’an Nuclear Instrument Factory,China National Nuclear Corporation,Xi’an 710061,China;2.China Nuclear Power Institute,China National Nuclear Corporation,Chengdu 610213,China |
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| Abstract: | In order to study the influencing factors of detector efficiency and limitation of the liquid gamma monitor XH-3130A on the measurement of radioactive pipe of some nuclear plants, the detector efficiency of peak region and full spectrum region of gamma ray in the range of 0.08-1.5 MeV by XH-3130A is calculated with MCNP5. As for the measurement of Cs-137 gamma source, the calculated results are in line with the experimental data. Meanwhile the paper analyses effects of different sources of gamma ray energy and probe arrangement on the detection efficiency of activity concentration. The simulation results show that the limit of the modified monitor XH-3130A is 1.35103 Bq/cm3 and meets the engineering requirements. |
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