無トリチウム水を製造するための電気分解-低温酸化を組み合わせた水製造装置の改良

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An experimental investigation was carried out on the improvement of a preparation system of tritium-free water, which is used as “back-ground water” in the determination of tritium with the liquid scintillation method, for environmental monitoring.The fundamental consideration was based on the recombination of hydrogen gas reduced tritium content and oxygen gas in laboratory conditions. An assembly for this system was made up of two units, an electrolytic degradation unit for the generation of H2 gas, and a circulation unit of N2 as carrier gas connected with a catalyst column and a cold trap for recombination to H2O. This apparatus was entirely made of glass, and designed as closed system. As operating conditions, the electric current, a circulation rate of N2 gas and a catalyst column temperature were 12A, 2.4l/min and 150°C, respectively.This system has proven to be suitable for preparation of tritium-free water, under the safe and sure condition. Three days are necessary to obtain 40ml of water.