<SESSION>FIXATION OF TRITIUM GAS BY A PINE TREE AND ITS SURROUNDINGS

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The fixation (oxidation) of atmospheric tritium gas (HT) in vegetation in in vitro experiments was determined for pine needles, pine bark, lichen attached to pine trees, taken from a coastal pine forest, and compared with that in soil. HT oxidation in pine needles was extremely low and about 1/40000 that in the surface soil, whereas its oxidation in pine bark with a lichen was almost 1000-7000 times that in pine needles. In vivo laboratory experiments on HT fixation in pine trees were conducted using one-way circuit inhalation apparatus and potted dwarf pine trees. After 2 hours of exposure to HT, tritium distribution and its specific activity in pine needles, branches, trunk, roots and soil were measured. Tritium distribution in the pine needles was 0.30% that in the soil. However, HT oxidation in the pine needles was only about 0.003% that in the soil.
核融合科学研究所の論文