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Updated: Jan 27, 2026

Imaging of In Situ Interferon Gamma Production in the Mouse Spleen following Listeria monocytogenes Infection
Published on: July 16, 2019
Guidance for in situ gamma spectrometry intercomparison based on the information obtained through five
Satoshi Mikami1, Daisuke Ishikawa2, Hideo Matsuda3
1Nuclear Emergency Assistance and Training Center, Japan Atomic Energy Agency, 11601-13 Nishi-jusanbugyo, Hitachinaka-city, Ibaraki, 311-1206, Japan.
Abstract:
Five intercomparisons of in situ gamma spectrometry by 6-7 participating teams were conducted between December 2011 and August 2015 at sites in Fukushima Prefecture that were affected by the fallout from the accident at the Fukushima Dai-ichi Nuclear Power Plant in March 2011. The evaluated deposition densities agreed within 5% and 4% in terms of the coefficient of variation for radiocesium (134Cs and 137Cs) and 40K, respectively, and the ratio of 134Cs/137Cs in deposition density agreed within 1% in terms of the coefficient of variation, by our best achievement through five intercomparisons. Two different methods for intercomparison were conducted: 1) simultaneous measurements in a narrow area within a 3 m radius; and 2) sequential measurements at an identical point. In a comparison between the two methods at a site where radiocesium was almost homogeneously distributed, no significant difference was observed between the results. The guidance for intercomparison method was proposed based on our experience, and are expected to be used effectively to ensure the reliability of in situ spectrometry.
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