MOISTURE CONCENTRATION MEASURING APPARATUS, MEASURING METHOD THEREOF, HYDROGEN GAS CONCENTRATION MEASURING SYSTEM, AND MEASURING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a moisture concentration measuring apparatus and a measuring method thereof dispensing with dehumidification of gas and sampling from the outside of a reactor container.

SOLUTION: A moisture concentration measuring apparatus 30 according to one embodiment causes a plurality of γ-ray detectors 3 to detect γ rays generated by pair annihilation caused by collision of a positron emitted from a positron source 1 in a reactor container 70 with a water molecule contained in an atmosphere. A coincidence circuit 5 outside the reactor container 70 measures the γ rays detected by the plurality of γ-ray detectors 3 in time series and identifies the locations of the γ-ray detectors that have detected the pair of two γ rays generated by the pair annihilation. A first signal processing unit 6a calculates a range of the positron from the identified γ-ray detectors and obtains the concentration of water molecule on the basis of the correlation between the concentration of water molecule and the range of the positron.

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