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利用中子与235U发生裂变反应的截面在裂变中子能区基本不变这一特点,可设计研制裂变靶室探测系统,该系统中子能量响应较平坦,在脉冲中子总数测量中有广阔的应用前景。利用K-400加速器稳态DT中子源,实验标定了235U裂变碎片在PIN探测器中的平均沉积能量,并与理论计算结果进行了比较。裂变靶室系统探测效率可通过数值计算准确给出,与平均沉积能量实验测量值相结合,可得到准确的中子灵敏度数据,进而获得裂变靶室探测系统中子能量响应曲线。
Using the characteristic of the fission neutron energy region that the section of fission reaction between neutron and 235U is basically unchanged, the fission target chamber detection system can be designed and developed. The neutron energy response of the system is flat and has a wide range in the measurement of total neutron flux The application prospects. The steady-state DT neutron source of K-400 accelerator was used to calibrate the average deposition energies of 235U fission fragments in the PIN detector. The results were compared with the theoretical results. The detection efficiency of fission target chamber system can be accurately given by numerical calculation. Combined with the experimental values of average deposition energy, accurate neutron sensitivity data can be obtained and the neutron energy response curve of fission target chamber detection system can be obtained.