堆外核测量系统源量程探测装置设计与测试

Abstract

Abstract: A boron lined proportional counter is used to design the source range measurement channel of the ex-core nuclear measurement system. A high sensitivity detector is developed and a set of source rang detection device is designed. The thermal neutron sensitivity on pile test methods are given. The sensitivity, discrimination threshold characteristics, high-voltage plateau characteristics, count rate linearity and measurement range of the detection device are tested and verified. The test results show that the detector has excellent radiation performance. The thermal neutron sensitivity can reach 22 s^-1/(cm^-2·s^-1), and the high-voltage plateau characteristic plateau length is 150 V, with plateau slope 28.3%/100 V. The pulse counting rate of the detector has a significant linear coincidence with the neutron fluence rate, and the upper limit of the neutron fluence measurement can reach 1×10⁵ cm^-2·s^-1, which meets the use requirements of the source range channel of the external nuclear measurement system. The source range detector can be widely used in nuclear power plant and marine external nuclear measurement and monitoring systems.

Key words: ex-core nuclear measurement system, source range, boron-lined proportional counter, radiation characteristics, neutron sensitivity, on pile test

CLC Number:

TL81

XIAO Wei, HU Chan, QIU Shunli, ZHAI Chunrong, DONG Jincheng, GE Mengtuan, ZHOU Yulin, ZENG Le. Design and testing of source range detector for nuclear measurement system outside reactor core[J].RADIATION PROTECTION, 2023, 43(3): 218-224.

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Design and testing of source range detector for nuclear measurement system outside reactor core

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