反应堆瞬发伽玛活化分析装置屏蔽性能研究

瞬发伽玛活化分析是一种高灵敏、非破坏的核分析技术。反应堆瞬发伽玛中子活化分析装置屏蔽设计是保护实验人员和提高装置分析灵敏度的重要保障。采用蒙特卡罗方法计算了中国先进研究堆瞬发伽玛活化分析装置的屏蔽性能和测量本底。利用公式修正的通过单晶铋过滤器的中子束流参数,使后续辐射水平计算结果更准确;采用分段-衔接的方法节省了计算时间。模拟结果显示,瞬发伽玛活化分析装置屏蔽性能满足辐射防护和低本底的要求,可为后续辐射防护措施的制定,实验人员辐射剂量优化以及同类装置屏蔽设计提供参考。

Study on Shielding Performance of Prompt Gamma Neutron Activation Analysis Facility on China Advanced Research Reactor

Prompt Gamma Neutron Activation Analysis is a highly sensitive and nondestructive nuclear analytical technique. The shielding design of the Prompt Gamma Neutron Activation Analysis facility is the important guarantee for protecting research-ers and increasing sensitivity. The shielding performance of the whole facility is obtained by use of Monte-Carlo calculation. Some approaches are adopted for obtaining beam parameter and saving the calculating time. The simulation results show that the design meets the requirements of radiation protection,and low gamma background. Some help was expected for radiation protec-tion measures,staff radiation dose optimization and shielding design of other similar systems.