ACCURACY OF CERENKOV MEASUREMENTS USING A LIQUID SCINTILLATION SPECTROMETER

Cerenkov counting efficiency varies with colour quenching and sample t urbidity. The activity in a plastic vial can be determined accurately with a colour quenching correction technique, regardless of the presen ce or absence of turbidity in a sample. On the other hand, the error o f the measured activity in a glass vial becomes large with increasing sample turbidity due to the dissimilarity of the quench correction cur ves for non-turbid and turbid samples.