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Nuclear Logging Rules of Thumb
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Trial Time Constant (TC) in Seconds:
400 Counts per Second (cps) .
(Hottest Zone cps) - (Coldest Zone cps)
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Log Speed in Feet per Minute (fpm) for 1 Foot Lag:
60 .
TC
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Time Constant (TC) in Seconds for a Given Line Speed for 1 Foot Lag:
60 .
fpm
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In the Illinois Basin, try 20 fpm with a 3 second Time Constant (TC).
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