In Situ Gamma Spectrometry Intercomparison in Fukushima, Japan

Satoshi MIKAMI; Shoji SATO; Yoshifumi HOSHIDE; Ryuichi SAKAMOTO; Naotoshi OKUDA; Kimiaki SAITO

doi:10.5453/jhps.50.182

Technical Data

In Situ Gamma Spectrometry Intercomparison in Fukushima, Japan

Satoshi MIKAMI, Shoji SATO, Yoshifumi HOSHIDE, Ryuichi SAKAMOTO, Naotoshi OKUDA, Kimiaki SAITO

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Keywords: intercomparison, in situ, gamma spectrometry, Fukushima, radiocesium, natural radionuclides, inventory

JOURNAL FREE ACCESS

2015 Volume 50 Issue 3 Pages 182-188

DOI https://doi.org/10.5453/jhps.50.182

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Abstract

Intercomparison of in situ gamma spectrometry was organized at a site contaminated by the radioactive fallout that originated from the Fukushima Dai-ichi Nuclear Power Plant accident. This intercomparison was conducted by eight teams from four different institutions, which have contributed to the government-led project to construct distribution maps of radionuclides deposited on the ground soil. The resultant ¹³⁴Cs and ¹³⁷Cs inventories evaluated by the participants agreed within 6% of the coefficient of variation, after correction for inhomogeneous distribution of the dose rate in air. The evaluated ⁴⁰K inventories agreed within 4% of the coefficient of variation. The authors estimated that these results were in good agreement for creating distribution maps of the radionuclide inventory in the ground soil.

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