Study of the elastic scattering effects of a slowing-down model on D–T neutron porosity logging  

作　　者：Shao-Heng Zhou Ying-Long Tao Bo Chang Li-Juan Hao Jie-Qiong Jiang Ya-Zhou Li Fang Wang Quan Gan FDS Consortium 

机构地区：[1]Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China [2]University of Science and Technology of China,Hefei 230026,China [3]International Academy of Neutron Science,Qingdao 266199,China [4]Thinking Neutron Technology Co.,Ltd.,Hefei 230031,China [5]Institute of Nuclear Science and Technology,Shandong University,Jinan 250061,China [6]Shandong Key Laboratory of Neutron Science and Technology,Qingdao 266199,China [7]不详

出　　处：《Nuclear Science and Techniques》2025年第5期206-215,共10页核技术(英文)

基　　金：supported by the Anhui Provincial Major Science and Technology Project(No.201903c08020003);the Taishan industrial Experts Program。

摘　　要：The application of a controllable neutron source for measuring formation porosity in the advancement of nuclear logging has garnered increased attention.The existing porosity algorithm,which is based on the thermal neutron counting ratio,exhibits lower sensitivity in high-porosity regions.To enhance the sensitivity,the effects of elastic and inelastic scattering,which influence the slowing-down of fast neutrons,were theoretically analyzed,and a slowing-down model of fast neutrons was created.Based on this model,a density correction porosity algorithm was proposed based on the relationship between density,thermal neutron counting ratio,and porosity.Finally,the super multifunctional calculation program for nuclear design and safety evaluation(TopMC/SuperMC)was used to create a simulation model for porosity logging,and its applicability was examined.The results demonstrated that the relative error between the calculated and actual porosities was less than 1%,and the influence of deviation in the density measurement was less than 2%.Therefore,the proposed density correction algorithm based on the slowing-down model of fast neutrons can effectively improve the sensitivity in the high-porosity region.This study is expected to serve as a reference for the application of neutron porosity measurements with D–T neutron sources.

关 键 词：D–T neutron source Slowing-down model Elastic scattering Neutron porosity 

分 类 号：TL99[核科学技术—核技术及应用]