Sealed neutron source and gamma source used in nuclearlogging have strong radioactivity which is harmful to operators.
核测井使用的密封中子源和伽马源具有较强的放射性，对操作人员有一定的辐射损伤。
2
Three different nuclearlogging combinations can be formed according to thermal neutron logging, epithermal neutron logging and density logging.
根据热中子测井、超热中子测井和密度测井，可以形成三种不同的核测井组合。
3
Forward modeling is used to determine the general response of most electromagnetic logging measurements, unlike nuclear measurements whose response is determined mainly in laboratory experiments.