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Updated: May 12, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
High sensitive airborne radioiodine monitor
Yoshimune Ogata1, Tadashi Yamasaki, Ryuji Hanafusa
1Graduate School of Nagoya University, Daiko-minami, Higashi-ku, 461-8673 Nagoya, Japan. ogata@met.nagoya-u.ac.jp
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 (125)I. The minimum detectable activity concentration was 1 × 10(-4)Bq cm(-3) for 1 min counting, which is one tenth of the legal limit for the radiation controlled areas in Japan.
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