| 摘要 |
PURPOSE:To achieve the miniaturization of an apparatus and to continuously collect 90% or more of the moisture in sample gas in a missing free state by one cooling part by humidifying the sample gas in sampling piping by a humidifying means. CONSTITUTION:A humidifying means is provided on the way of the sampling piping passing through the outlet part of the discharge gas from an atomic power plant and the inlet part of a cooling part 7. Humidifying moisture is supplied to the sample gas passing through the sampling piping 6 from a water adding tank 21 through the conduit 23, throttle valve 25 and Venturi 24 on the way of the sampling piping 6 during continuous sampling to humidify the sample gas. Further, by heating the sampling pipe 6 by the heater 26 provided on the downstream side of the Venturi 24, the moisture supplied to the sample gas is perfectly evaporated to be mixed with the existing moisture containing tritium contained in the sample gas. That is, high collecting efficiency not obtained unless the sample gas cooled to 0 deg.C or lower is obtained. By this method, 90% or more of the moisture in the sample gas can be collected in a missing free state.
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