Zr-V-Feゲッターによるトリチウムガスの吸蔵および再放出

概要

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Development of tritium handling techniques is of great importance for thermonuclear fusion experiments. In such experimental devices, tritium will be stored in some suitable getter materials, released to gas phase due to heating and recovered again by the getter after use. From this viewpoint, we examined absorption and desorption of tritium by a getter material (Zr-V-Fe) delivered from SAES Getters using a mass spectrometer. Tritium amounted to 5Ci was stored in the getter of 300mg (Zr-V-Fe) at room temperature after activation at 780℃in vacuo (7x10-5 Torr). The tritium began to appear in a gas phase in a measurable level at around 200℃, however, most of the tritium appeared in the gas phase as HT. Raising the temperature resulted in an increase in the T2/HT ratio due to the increase in the tritium pressure. The tritium released in the gas phase could be efficiently recovered by the getter at room temperature. The tritium pressure decreased below 1x10-9 Torr. The pumping speed was estimated to be as large as 8cc/sec・mg. It was revealed that hydrogen in HT was due to an exchange reaction between the released tritium and residual hydrogen.
富山大学の論文