油垢厚度检测中的入射中子束设计  

Design of Incoming Neutron-Beam for Detecting Oil Dirt

作　　者：赵经武[1] 陈晓城[1] 阿里木江.乃买提 艾尔肯.阿不列木 

机构地区：[1]南京大学物理学院,江苏南京210093 [2]新疆大学科学与技术学院,新疆乌鲁木齐830046

出　　处：《同位素》2012年第2期82-85,共4页Journal of Isotopes

基　　金：国家自然科学基金资助(10965007);江苏高校优势学科建设工程资助

摘　　要：在中子背散射测量技术中,由于中子的自屏蔽效应,使测量的背散射热中子计数出现非线性,并趋向于饱和,引起测量精度下降,测量范围受到限制。本工作通过简单模型,采用文献提出的技术原理,初步探讨热中子和超热中子入射比对油垢厚度检测中非线性的改善情况。由简单模型和实验测量结果比较可见,采用中子背散射测量油垢厚度时,将热中子和超热中子按一定的比例入射,有助于改善非线性效应,提高油垢厚度检测的水平。For the technique of neutron back-scattering,the neutron counts are non-linear and have a tendency toward saturation because of the neutron self-shielding.As a result,the measurement accuracy is reduced and the measurement range is limited.Using a simply model and comparing with experimental data,it is shown that,in the measurement of the thickness of oil dirt,by adjusting the ratio of thermal to epithermal neutrons,the neutron self-shielding is weakened.As a result,the non-linearity can be reduced and the measurement accuracy and range can be improved.

关 键 词：油垢 中子背散射 中子束 

分 类 号：TL816.3[核科学技术—核技术及应用] O571.323[理学—粒子物理与原子核物理]