Influence of air temperature and humidity on simultaneous collection of H-3 and C-14 by mono-ethanolamine solution

Lumagel Plus scintillator was selected as the most suitable scintillator for simultaneous collection of H-3 and C-14 by using mono-ethanolamin (MEA) solution. The influence of air temperature and humidity on the collection efficiency of H-3 and C-14 was examined. As the result, when the weight of water in MEA was less than 1000 mg, the samples became colorless without separation into two phases, and the collection efficiency of 99% and more was obtained for C-14 within the collection time of 3.7 hours. On the other hand, the collection efficiency for H-3 decreased with increase of the weight of water in the collected air, but it was more than 90% even at high temperature of 30°C and high relative humidity of 90%. It was found that this method is practically useful for simultaneous determination of H-3 and C-14 concentration in air. (author)