| 摘要 |
PURPOSE:To automatically equalize the kinds and pressures of gases in both ionization boxes for compensation and measurement even if the kind and pressure of purge gas to be used changes and to facilitate the handling of concn. measurement, by allowing purge gas before flowing into a purge gas passage to pass through the compensation ionization box. CONSTITUTION:Air 100 to be detected is passed through a membrane separator 10 and tritium water in the air 100 to be detected is taken in the purge gas 200 sent into the membrane separator 10 to measure the concn. of tritium. Take-in ports and take-out ports of purge gas 200 are respectively provided to both of the measuring ionization box 48 and compensation ionization box 50 of a measuring device and the purge gas supplied from a gas bomb 40 passes through the compensation ionization box 50 to enter the membrane separator 10 and, therefore, even if the gas bomb 40 is replaced or the kind or pressure of the purge gas 200 is changed, the kinds and pressures of the gases in both ionization boxes 48, 50 become automatically equal and handling becomes easy and the concn. of tritium can be accurately measured.
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