【作者】 王胜； 李航； 曹超； 唐科； 吴洋； 霍合勇； 唐彬；

【Author】 Sheng Wang;Hang Li;Chao Cao;Ke Tang;Yang Wu;Heyong Huo;Bin Tang;Institute of Nuclear Physics and Chemistry,CAEP;

【机构】 中国工程物理研究院核物理与化学研究所；

【摘要】 基于MCP的热中子探测技术近年来发展迅速,该技术能够实现高空间分辨率和高探测效率。本文利用MCNP程序,对掺杂型热中子敏感MCP板的探测效率进行蒙卡模拟计算,针对不同结构形状和几何尺寸的MCP板,在不同成分不同比例的中子敏感材料掺杂情况下,计算其对热中子的探测效率。通过计算,初步得到了较为优异的MCP板结构参数和材料成分,为后续的MCP探测器开发提供帮助。对¹⁰B的掺杂计算表明,掺杂浓度较大时,MCP板厚度为2mm时,探测效率接近80%,对15μm的栅格大小,高掺杂比例时最佳探测效率出现在MCP通道直径为10-12μm时。更多还原

【Abstract】 The thermal neutron detection method with Microchannel Plates(MCP) has developed a lot in the last several years, which could supply high spatial resolution and high time differentiate for thermal neutron detection. This thesis will calculate the detection efficiency of thermal neutron MCP doped of Boron and Gadolinium with MCNP. The calculation will compare the detection efficiency with different thickness of MCPs, different doped materials, different doped proportion and different structure of MCPs. The calculation results show that, the optimal structure of MCP decided by the doped proportion. With high proportion of Boron doped into MCPs, the detection efficiency will be nearly to 80% with the thickness of MCPs as 2mm. When the grid size of MCPs is 15μm, the optimal neutron detection efficiency appears with channel diameter size as 10-12μm.更多还原