Abstract
An instrument is described using a single cooled photomultiplier for routine analysis of tritium in urine. The quenching effects and luminescence of urine treated by various methods are determined. For urine treated with activated charcoal the average activity required to double the background counting rate is 2 nanocuries per ml with an efficiency of 5%. The effects of temperature on the background count rate and the counting efficiency are determined. The complications introduced by 14C activity in the urine are considered.
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