Mechanism of Tritium Gas Oxidation in the Environment

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To determine what actually convert HT to tritiated water in the environment, soil and airborne bacteria were isolated from the soils and air in the test plots Chalk River Laboratories in Canada and the isolated strains were screened for HT oxidation activity. The number of HT-oxidizing bacteria isolated from soils was highest in the surface soils and the occurrence rates of HT-oxidizing bacteria in the soils different in depth were comparable with HT oxidation activity in the soils. These results indicated that these HT oxidizing bacteria play a dominant role in HT oxidation in soil. The occurrence rates of HT-oxidizing airborne bacteria were 2-4 %. The identification of some of HT-oxidizing soil and airborne bacteria was conducted and most of them were actinomycesas well as HT oxidizing soil bacteria. Isolation and identification of HT oxidizing bacteria from a moss and pine roots also conducted.