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Spectroscopic gamma camera for use in high dose environments

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Title: Spectroscopic gamma camera for use in high dose environments
Authors: Ueno, Yuichiro Browse this author
Takahashi, Isao Browse this author
Ishitsu, Takafumi Browse this author
Tadokoro, Takahiro Browse this author
Okada, Koichi Browse this author
Nagumo, Yasushi Browse this author
Fujishima, Yasutake Browse this author
Kometani, Yutaka Browse this author
Suzuki, Yasuhiko Browse this author →KAKEN DB
Umegaki, Kikuo Browse this author
Keywords: Gamma camera
Pinhole collimator
CdTe detector
Issue Date: 22-Jun-2016
Publisher: Elsevier
Journal Title: Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment
Volume: 822
Start Page: 48
End Page: 56
Publisher DOI: 10.1016/j.nima.2016.03.064
Abstract: We developed a pinhole gamma camera to measure distributions of radioactive material contaminants and to identify radionuclides in extraordinarily high dose regions (1000 mSv/h). The developed gamma camera is characterized by: (1) tolerance for high dose rate environments; (2) high spatial and spectral resolution for identifying unknown contaminating sources; and (3) good usability for being carried on a robot and remotely controlled. These are achieved by using a compact pixelated detector module with CdTe semiconductors, efficient shielding, and a fine resolution pinhole collimator. The gamma camera weighs less than 100 kg, and its field of view is an 8 m square in the case of a distance of 10 m and its image is divided into 256 (16x16) pixels. From the laboratory test, we found the energy resolution at the 662 keV photopeak was 2.3% FWHM, which is enough to identify the radionuclides. We found that the count rate per background dose rate was 220 cps h/mSv and the maximum count rate was 300 kcps, so the maximum dose rate of the environment where the gamma camera can be operated was calculated as 1400 mSv/h. We investigated the reactor building of Unit 1 at the Fukushima Dai-ichi Nuclear Power Plant using the gamma camera and could identify the unknown contaminating source in the dose rate environment that was as high as 659 mSv/h.
Rights: © 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 上野 雄一郎

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