中子多重性探测器搭建及参数标定  

Neutron multiplicity counter design and calibration

作　　者：陈利高[1,2] 刘晓波[2] 龚建[2] 王侃[1] 董传江[2] 荣茹[2] 鲁艺[2] 

机构地区：[1]清华大学工程物理系,北京100084 [2]中国工程物理研究院核物理与化学研究所,绵阳621900

出　　处：《清华大学学报（自然科学版）》2014年第2期159-163,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(11175164)

摘　　要：该文介绍了自主设计的中子多重性探测器构成模块和搭建方法,以及相应的参数标定算法。在参数标定过程中,首先使用Am-Li中子源的相关计数率与本底计算率差值趋零化方法,提出了预延迟的标定公式;在均方差最小化基础上建立了三均分算法,进行了中子多重性死时间系数的拟合标定。根据6组252 Cf中子源获取的9个标定参数,利用中子多重性探测器对2个钚金属样品进行了测试,测试结果验证了探测器搭建方法的合理性及参数标定算法的正确性。A neutron multiplicity counter is designed and calibrated with the integrated electronics data acquisition and processing software described here. The predelay time length search equations are developed by balancing the correlated counts and the background counts of AmLi neutron sources. A deadtime coefficient fitting method minimizes the root mean square. Nine parameters are acquired and two plutonium samples are used to verify the counter performance and parameter calibration algorithm. Test results show that the design and calibration for neutron multiplicity measurements are valid.

关 键 词：中子多重性 探测器搭建 参数标定 死时间拟合 

分 类 号：TL99[核科学技术—核技术及应用]