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Title: First On-Site True Gamma-Ray Imaging-Spectroscopy of Contamination near Fukushima Plant
Authors: Tomono, Dai
Mizumoto, Tetsuya
Takada, Atsushi
Komura, Shotaro
Matsuoka, Yoshihiro
Mizumura, Yoshitaka kyouindb researcher_resolver
Oda, Makoto
Tanimori, Toru
Author's alias: 友野, 大
水本, 哲矢
高田, 淳史
谷森, 達
Issue Date: 3-Feb-2017
Publisher: Springer Nature
Journal title: Scientific Reports
Volume: 7
Thesis number: 41972
Abstract: We have developed an Electron Tracking Compton Camera (ETCC), which provides a well-defined Point Spread Function (PSF) by reconstructing a direction of each gamma as a point and realizes simultaneous measurement of brightness and spectrum of MeV gamma-rays for the first time. Here, we present the results of our on-site pilot gamma-imaging-spectroscopy with ETCC at three contaminated locations in the vicinity of the Fukushima Daiichi Nuclear Power Plants in Japan in 2014. The obtained distribution of brightness (or emissivity) with remote-sensing observations is unambiguously converted into the dose distribution. We confirm that the dose distribution is consistent with the one taken by conventional mapping measurements with a dosimeter physically placed at each grid point. Furthermore, its imaging spectroscopy, boosted by Compton-edge-free spectra, reveals complex radioactive features in a quantitative manner around each individual target point in the background-dominated environment. Notably, we successfully identify a "micro hot spot" of residual caesium contamination even in an already decontaminated area. These results show that the ETCC performs exactly as the geometrical optics predicts, demonstrates its versatility in the field radiation measurement, and reveals potentials for application in many fields, including the nuclear industry, medical field, and astronomy.
Description: 放射線発見以来初の幾何光学に基づくガンマ線画像化法を発見・実用化 : ガンマ線完全可視化により放射線利用の安全評価が正確に. 京都大学プレスリリース. 2017-02-14.
Rights: © The Author(s) 2017. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
URI: http://hdl.handle.net/2433/218099
DOI(Published Version): 10.1038/srep41972
PubMed ID: 28155883
Related Link: http://www.kyoto-u.ac.jp/ja/research/research_results/2016/170203_1.html
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