中子剂量仪在脉冲辐射场中的漏计数校正研究

Study on the Correction Methods of the Neutron Detectors' Omitted Counting Leakage

中子剂量仪在加速器周围的脉冲辐射场中应用时存在漏计数现象,会影响辐射监测量值的准确性,需要修正。根据加速器束流脉冲参数推导出加速器辐射场中中子剂量仪的计数率与校正因子的修正公式,可以有效补偿中子剂量仪的漏计数。在北京正负电子对撞机(BEPCII)直线加速器的脉冲辐射场中进行实验,由实验结果求出修正公式中的未知参数,得到了修正公式。同时,使用被动式探测器CR39测量实验位置的累积中子剂量,对比两种探测器实验结果,验证了修正公式的有效性。

There is leakage counting phenomenon when neutron dosimeter used in pulsed radiation field around the accelerators,which affects the accuracy of the radiation monitoring value,should be corrected.According to the accelerator beam pulse parameters,the correction formula of the counting rate and the correction factors of the neutron dosimeter were deduced,which can effectively compensate the leakage count of the neutron dosimeter.The experiment was carried out in the pulsed radiation field of the BEPCII linear accelerator.The unknown parameters in the modified formula were obtained from the experimental results,and the correction formula was obtained.At the same time,the cumulative neutron dose of the experimental position was measured by the passive detector CR39,and the validity of the modified formula was verified by comparing the experimental results of the two detectors.