Extractive scintillators for alpha liquid scintillation counting. Anomalies in quenching evaluation

Two important effects in quenching evaluation when using some commercial extractive scintillators in alpha liquid scintillation counting are described. One affects the system quenching value but not the efficiency, while the other modifies the efficiency with no important change in the quenching. For these cocktails, alternative procedures for efficiency evaluation must be chosen. We propose an inner standard procedure which gave adequate results in the application to different kinds of samples. (author)