トリチウムをトレーサーとする熱分析装置の開発(?) : 性能試験と問題点

概要

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Heat of reaction data are needed for examining interactions between hydrogen isotopes and materials used in thermonuclear fusion reactors. To measure the heat itself produced from hydrogen (tritium) -material interactions, a thermal analysis system provided with a tritium measuring device was established. It consisted of a differential scanning calorimeter (DSC) and ionization chamber. The DSC was modified to assure that there would be no leakage of tritium and removal of tritium contamination. Its performance was assessed with respect to stability of the base line in DSC measurement, and desorption of D2 (DT) from Zr-V-Fe getter (dry gas desorption) and H2O(HTO) from CuSO4・5H2O(HTO) (wet gas system). The heat of desorption of D2(DT) could be determined directly. For wet gas desorption, however, heat determination differed considerably from that by other methods. The reason for this was the adsorption of HTO on the inner surface of the pipe line and ionization chamber