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为建立1套基于TEPC系统的测量方法,在γ、中子场分别对探测器LET-1/2进行了性能测试,在252Cf自发裂变源的中子辐射场中对其进行刻度,确定出刻度因子。对该中子源的脉冲幅度谱进行了转换,得到混合场的微剂量谱(图1),分析其中中子和γ对剂量的贡献成分;根据所得脉冲幅度谱,计算出相应的剂量率及剂量当量率。且依据具体的实验环境,使用蒙特卡罗方法(MCNP)进行了模拟计算,所得结果与实验数据取得较好的一致性,结果列于表1。从而验证所建立的TEPC测量中子辐射场的吸收剂量的方法是切实可行的。
In order to establish a set of measurement methods based on TEPC system, the detector LET-1/2 was tested in the γ and neutron fields respectively, and the scale was calibrated in the 252Cf spontaneous fission source neutron radiation field factor. The pulse amplitude spectrum of the neutron source was converted to obtain the micro-dose spectrum of the mixed field (Figure 1), and the contribution of the neutron and γ to the dose was analyzed. Based on the obtained pulse amplitude spectrum, the corresponding dose rate and Dose equivalent rate. And according to the specific experimental environment, the Monte Carlo method (MCNP) was used to simulate the calculation results obtained with the experimental data obtained better consistency, the results are shown in Table 1. Thus verifying the established TEPC method of measuring the absorbed dose of the neutron radiation field is feasible.