| 摘要 |
PROBLEM TO BE SOLVED: To easily and accurately measure and evaluate the amount of radiation being discharged into the atmosphere even if a blow-out panel is released by measuring the differential pressure between the inside and outside of a building, at the same time evaluating the amount of radioactivity being discharged to the outside from the building in time series based on the measurement value of the radiation in the space where the blow-out panel has been installed. SOLUTION: A differential pressure meter 3 is provided at an installation area 1 where a blow-out panel 2 has been installed, thus measuring the differential pressure between the area 1 and the outside of a building. A discharge flow rate W from the area 1 to the atmosphere is obtained from the measurement value of the differential pressure by calculation. On the other hand, the amount of radiation of the area 1 is measured by a radiation detector 4. In this case, a radioactivity concentration C in the area 1 is expressed by C=k.R (k: a conversion coefficient for converting the amount of radiation to the amount of radioactivity) when the amount of radiation is set to R. When the blow-out panel 2 is released, an amount of radioactivity Q being discharged to the atmosphere is expressed by Q=C.W according to the discharge flow rate in the area 1 and the radioactivity concentration C, thus automatically calculating the amount of radioactivity by a device 5 for calculating the amount of radioactivity.
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