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。
Sealed neutron source and gamma source used in nuclear logging 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。
Sealed neutron source and gamma source used in nuclear logging have strong radioactivity which is harmful to operators.
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