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基于微通道板的中子探测器γ射线灵敏度
Gamma ray sensitivity of neutron detector based on microchannel plate
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摘要: 研制了一种基于微通道板的超快脉冲中子探测器,对其γ射线灵敏度进行了理论和实验研究.建立了探测器的γ射线灵敏度理论计算模型,利用蒙特卡罗方法模拟计算了不同能量γ射线在不同厚度聚乙烯靶中产生的出射电子能谱和出射角度分布,并结合经验公式计算了单个电子在微通道板(MCP)孔道中产生的二次电子产额,最后得到了探测器的γ射线灵敏度,结果表明当聚乙烯靶厚度大于某一值时,γ射线灵敏度基本相同.利用西北核技术研究所的标准γ射线放射源对探测器的γ射线灵敏度进行了实验标定,实验结果与理论计算结果一致.Abstract: A new ultrafast pulse neutron detector based on MCP is introduced.The γ-ray sensitivity of the detector was in-vestigated through simulation and experiment.A model of theoretical simulation was set up for γ-ray sensitivity calculation.In this model,the energy spectra and emitting angle distribution of electrons which were produced by different energy's γ-ray inj ec-ting into the different thickness'polyethylene were calculated through Monte Carlo methods.Then,the yields of secondary elec-trons produced by the single electron inj ecting into microchannel of MCP were also calculated through the experiential formula. The γ-ray sensitivity of the detector was finally obtained.The results shown that the γ-ray sensitivity of the detector was almost constant when the thickness of polyethylene was above a certain value.Some experiments were performed to test the γ-ray sensi-tivity at the standard gamma ray sources of Northwest Institute of Nuclear Technology.The simulated results agree with the re-sults of experiments considering the uncertainties.
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