Patent Document ID: 4002909
Application ID: 04674083
Patent Flag: 1

Claim One:
1. Apparatus for optimizing counting conditions in test samples containing n radioactive isotopes disposed in a liquid scintillator with each isotope being of the type that produces an observable energy spectrum, said apparatus comprising a light transducer, means for positioning a sample adjacent said transducer in light transmissive relationship therewith, means for measuring a selected quench indicating parameter indicative of the quench level of the sample, n pulse height analyzers for analyzing pulses emanating from said transducer, said n pulse height analyzers each including means for discriminating pulses on the basis of pulse heights, and means responsive to the value of said measured quench indicating parameter for automatically adjusting said discriminating means relative to the observed spectrum for each isotope, said adjusting means being characterized by its ability to adjust said discriminating means relative to the observed spectrum for each isotope by one of m predetermined, preset, amounts selected in response to the value of said measured parameter and corresponding to preselected quench levels at which counting efficiencies are accurately known.