Abstract
Liquid scintillation counting with electrolysis enrichment is now the most popular method to measure the tritium concentration in the low level water samples such as environmental water samples. It takes, however, much time and a lot of doings, but it has not a sufficient accuracy. We have sophisticated all of the procedure, using a conventional electrolysis enriching apparatus and a conventional liquid-scintillation counter. As the result, we have achieved the detection limit of 0.02 Bq/L in 2 days enrichment and 25 hours counting. Furthermore, we considered the possibility to lower the detection limit and we were able to prospect to measure until 0.0005 Bq/L, starting from 1 L sample water, in 1 week enrichment and 1 week counting.
