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.
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.
MAEKAWA TATSUYUKI
IZUMI MIKIO
KENJO HIROAKI
Izawa Akira
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