Abstract
A simultaneous sampling system for the speciation of atmospheric T and 14C has been developed. Firstly tritiated moisture together with all water vapor in air is adsorbed on Drierite after coagulation using an electric cooler. Then 14CO2 plus stable CO2 in the dried air is adsorbed on molecular sieve 4A. Elemental tritium gas (HT) plus hydrogen gas (H2) in the atmosphere along with H2 gas generated from electrolysis of groundwater which does not contain any T, are oxidized on Pd catalyst to water and adsorbed on molecular sieve 3A. Tritiated methane (CH3T) and 14CH4 plus stable methane in the atmosphere are oxidized on Pt catalyst to water and CO2 under 400 °C. Then, Drierite and molecular sieve 4A adsorb the oxidized T (HTO) and C-14 (14CO2), respectively. Tritium and C-14 in surface and soil air have been measured using this system
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