³H-標識化合物の放射線分解による揮発性分解物の生成

抄録

In order to estimate the internal exposure dose in an experiment using tritiated thymidine, the rate of volatile ³H-decomposition of several tritiated thymidine samples was measured. The decomposition rate of [methyl-³H] thymidine in water was over 80% in less than one year after initial analysis. [methyl-³H] thymidine was decomposed into volatile and non-volatile ³H-decomposition products. The ratio of volatile ³H-decomposition products increased with increasing the rate of the decomposition of [methyl-³H] thymidine. The volatile ³H-decomposition products consisted of two components, of which the main component was tritiated water. Internal exposure dose caused by the inhalation of such volatile ³H-decomposition products of [methyl-³H] thymidine was assumed to be several μSv.