IEEE N42.15-1997

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 Counting system efficiencyReproducibility of sample and background count ratesPreparation of check sources for performance evaluationDefinitions of some terms used here are given in Clause .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.