TRITIUM ANALYSIS IN URINE BY THE TRIPLE-TO-DOUBLE COINCIDENCE RATIO METHOD WITH THE HIDEX 300 SL LIQUID SCINTILLATION COUNTER.

The triple-to-double coincidence ratio (TDCR) method is a liquid scintillation primary method for the absolute activity measurement of pure β- and pure electron capture emitters. This method requires specific three-photomultiplier liquid scintillation counters. The aim of the present work is to assess the TDCR method performance for routine tritium analysis in urine using an HIDEX 300 SL, the only three-photomultiplier liquid scintillation counter designed for routine laboratories.