Abstract
Airborne radioiodine monitoring includes a problem in that commercial radioactive gas monitors have inadequate sensitivity. To solve this problem, we designed a highly sensitive monitoring system. The higher counting efficiency and lower background made it possible to perform the low-level monitoring. The characteristics of the system were investigated using gaseous 125I. The minimum detectable activity concentration was 1×10−4Bqcm−3 for 1min counting, which is one tenth of the legal limit for the radiation controlled areas in Japan.
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