熱焼法による黒鉛中のトリチウム・インベントリーの評価

概要

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To measure tritium inventory in graphite, we developed a simple and reliable method by combining the combustion-liquid scintillation counting technique. Namely, the sample was burned in an oxygen flow and tritiated water which was produced was trapped by two water bubblers made of glass connected in series. The error of the measurements was within 5%. The tritium memory effect during the measurement series was negligible if the total amount of tritium handled was below 10-6 Ci. With the use of this method, the tritium inventory in graphite samples, which was prepared by use of 3He(n,p)3H nuclear reaction, was measured. It was revealed that most of the tritium trapped in the graphite was desorbed by the diffusion controlled process. In addition, it was observed that the diffusion rate was quite slow even at 1000℃: the diffusion coefficient was estimated to be 3.5x10-13 cm2/sec at 1000℃. This means that only about 30% of the recoil injected tritium desorbs due to heating at 1000℃ for 1hr.
富山大学の論文