小容積電離箱による高濃度トリチウムの in situ測定

概要

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For the research and development of D-T thermonuclear fusion devices, in situ methods to measure high levels of tritium should be established. Thus, a small ionization chamber was made and examined for its applicability to in situ and real time measurements of high levels of tritium. The ionization chamber was easily constructed, did not leak owing to VCR fitting and a considerably small effective volume of 1.9cm3. Excellent saturation-current characteristics were observed at an applied voltage above +20V to the center electrode when the chamber was filled with tritium gas mixed with hydrogen isotopes at a pressure below 1 atm. No special power source or electric circuit was required. The present system showed excellent linearity in a wide concentration range from 1x10-6 to 3x10-1 Ci/cm3, when the total pressure was kept constant at 1 atm. Consequently, it was concluded that the small ionization chamber developed in the present study was quite useful for in situ and real time measurements of high levels of tritium in tritium processing in magnetic fusion devices.
富山大学の論文