スピニングローターゲージによるトリチウムガス及び水素同位体混合気体の絶対圧測定

概要

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To understand the compatibility of the spinning rotor gauge with tritium handling during fusion experiments, tritium gas and/or gas mixtures of hydrogen isotopes were measured with the spinning rotor gauge in pressure ranges of 10-5 to 10 Pa. It was observed that it is possible to determine the absolute pressure of tritium gas and/or gas mixtures of hydrogen isotopes within several percent errors as well as determining the absolute pressure of pure gas by using the mole fraction of the component gases in the mixture. Additionally, it was found that the sensitivity and the offset value do not change with a tritium exposure amounting to 1.9x105 Pa・s. Therefore, we concluded that the spinning rotor gauge is free from any tritium β-ray effects. From this result, it was concluded that a spinning rotor gauge is quite useful to tritium handling systems, including thermonuclear fusion devices, as a transfer standard and/or absolute pressure gauge.