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IEEE N42.15 1997 Edition, 1997
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American National Standard Check Sources for and Verification of Liquid-Scintillation Counting Systems
Includes all amendments and changes through Reaffirmation Notice , December 2, 2004
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The specifications for check sources to be used in the evaluation of liquid-scintillation counter performance are included in this standard.

Measures of performance considered in this standard are

a) Counting system efficiency

b) Reproducibility of sample and background count rates

c) Preparation of check sources for performance evaluation

Definitions of some terms used here are given in Clause 3.

This standard does not cover the calculation of sample activity for quenched unknown samples. Accordingly, this standard does not deal with sample preparation, efficiency correlation (quench correction) procedures, or identification of unknown radionuclides.