In liquid scintillation counting while automatic quenching compensation (or automatic efficiency control) is carried on
some abnormal phenomena may occur with the sample channels ratio curves. For Instance channels ratio may return or over one. In these cases
the values of the sample channels ratio can not be used for quenching calibration. The abnormal phenomena could be used to identify whether the lower discriminators of the two channels are equivalent.
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references
D. L. Horrocks , Liquid scintillation counting , Vol.5 , 1978 ,p. 145 .