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Nuclear Logging Rules of Thumb
Trial Time Constant (TC) in Seconds:
400 Counts per Second (cps)
.
(Hottest Zone cps) - (Coldest Zone cps)
Log Speed in Feet per Minute (fpm) for 1 Foot Lag:
60
.
TC
Time Constant (TC) in Seconds for a Given Line Speed for 1 Foot Lag:
60
.
fpm
In the Illinois Basin, try 20 fpm with a 3 second Time Constant (TC).
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Last 10-20-10
