高灵敏中子裂变计数器设计  

Design of a High-Sensitivity Neutron Fission Counter

作　　者：杨昉东 赵江滨[1] 刘洋[1] 田华阳[1] 刘海峰 梁爽 邵俊琪 谢乔 郝晓勇[1] 张向阳[1] 何高魁[1] YANG Fang dong;ZHAO Jiang-bin;LIU Yang;TIAN Hua-yang;LIU Hai-feng;LIANG Shuang;SHAO Jun-qi;XIE Qiao;HAO Xiao yong;ZHANG Xiang yang;HE Gao-kui(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核电子学与探测技术》2020年第3期438-442,共5页Nuclear Electronics & Detection Technology

基　　金：国家财政部稳定支持研究经费(WDJC-2019-8)资助。

摘　　要：研制了一种可在550℃高温下工作的高灵敏中子裂变计数器。该计数器采用多层平板电极和一体化无机铠装电缆的结构,电极表面涂镀含有高富集度235U的U3O8作为裂变物质。测试结果表明:该计数器热中子脉冲灵敏度达到1.3nv^-1·s^-1,坪斜为1.6%/100 V,室温下坪长超过1600V,在550C时坪长为150V,很好地满足了反应堆测量孔道的工况条件和测量要求。A high-sensitivity neutron fission counter that can work at 550℃ was developed.Structures of parallel plate-type electrodes and integrated inorganic mineral insulated cable were introduced in the design.The surfaces of electrodes were coated with U3O8 enriched high abundance 235U as a fission material.According to the testing results,the thermal neutron sensitivity of the counter reached 1.3 cps/nv,the plateau slope was 1.6%/100V,the plateau length exceeded 1600V at room tem perature,it can still operate normally at 550℃ and the plateau length was 150 V at 550℃,meeting the working conditions and requirements of the reactor duct channel.

关 键 词：反应堆 源量程 中子探测器 

分 类 号：TL816.3[核科学技术—核技术及应用]