涂硼稻草管是一种新型的3He替代探测器,能广泛满足中子散衍射、军控核查、无损检测等领域的大面积低能中子测量需求.本文系统研究了PTI-204型稻草管探测器甄别阈对中子和γ计数的影响,优选出最佳甄别阈值.并在此基础上,利用实验室放射源测量了γ射线甄别率和热中子探测效率.结果表明:PTI-204的γ射线的甄别率可达约10?8,热中子的探测效率约为20%,是一种极具潜力的3He替代探测器.%[Background] Boron-coated straw detector is a new type of 3He replacement neuron detector, which can be used for large-area low-energy neutron detection in the field of neutron scattering, arms control, and neutron interrogation. [Purpose] This study aims to obtain the thermal neutron detection performance of boron-coated straw detector with strong γ radiation background. [Methods] The PTI-204 boron-coated straw detector was taken for study the influence of discrimination threshold to neutron counting against the gamma counting. Both the detection efficiency of γ-ray and thermal neutron were measured with standard radiation sources of 137Cs and 252Cf. [Results] The results indicated that the gamma-ray resolution of the PTI-204 detector is up to~10?8, and the thermal neutron detection efficiency is about 20%. [Conclusions] The performances of the boron-coated straw detector indicated that it was a good choice for replacing of the expensive 3He tube for neutron detection.
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