First On-Site True Gamma-Ray Imaging-Spectroscopy of Contamination near Fukushima Plant

被引：23

作者：

Tomono, Dai ^{[1
]}

Mizumoto, Tetsuya ^{[1
]}

Takada, Atsushi ^{[1
]}

Komura, Shotaro ^{[1
]}

Matsuoka, Yoshihiro ^{[1
]}

Mizumura, Yoshitaka ^{[1
,2
]}

Oda, Makoto ^{[1
]}

Tanimori, Toru ^{[1
,2
]}

机构：

[1] Kyoto Univ, Grad Sch Sci, Sakyo Ku, Kyoto 6068502, Japan

[2] Kyoto Univ, Unit Synerget Studies Space, Sakyo Ku, Kyoto 6068502, Japan

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

关键词：

COMPTON CAMERA;

D O I：

10.1038/srep41972

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：10

共 19 条

[1] Evaluation of forest decontamination using radiometric measurements [J].

Cresswell, Alan J. ;

Kato, Hiroaki ;

Onda, Yuichi ;

Nanba, Kenji .

JOURNAL OF ENVIRONMENTAL RADIOACTIVITY, 2016, 164 :133-144

[2]

IAEA, 2000, IAEATECDOC1162

[3] A prototype of aerial radiation monitoring system using an unmanned helicopter mounting a GAGG scintillator Compton camera [J].

Jiang, Jianyong ;

Shimazoe, Kenji ;

Nakamura, Yasuaki ;

Takahashi, Hiroyuki ;

Shikaze, Yoshiaki ;

Nishizawa, Yukiyasu ;

Yoshida, Mami ;

Sanada, Yukihisa ;

Torii, Tatsuo ;

Yoshino, Masao ;

Ito, Shigeki ;

Endo, Takanori ;

Tsutsumi, Kosuke ;

Kato, Sho ;

Sato, Hiroki ;

Usuki, Yoshiyuki ;

Kurosawa, Shunsuke ;

Kamada, Kei ;

Yoshikawa, Akira .

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, 2016, 53 (07) :1067-1075

[4] Electron-tracking Compton gamma-ray camera for small animal and phantom imaging [J].

Kabuki, Shigeto ;

Kimura, Hiroyuki ;

Amano, Hiroo ;

Nakamoto, Yuji ;

Kubo, Hidetoshi ;

Miuchi, Kentaro ;

Kurosawa, Shunsuke ;

Takahashi, Michiaki ;

Kawashima, Hidekazu ;

Ueda, Masashi ;

Okada, Tomohisa ;

Kubo, Atsushi ;

Kunieda, Etuso ;

Nakahara, Tadaki ;

Kohara, Ryota ;

Miyazaki, Osamu ;

Nakazawa, Tetsuo ;

Shirahata, Takashi ;

Yamamoto, Etsuji ;

Ogawa, Koichi ;

Togashi, Kaori ;

Saji, Hideo ;

Tanimori, Toru .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2010, 623 (01) :606-607

[5] Development of a low-cost-high-sensitivity Compton camera using CsI (Tl) scintillators (γI) [J].

Kagaya, M. ;

Katagiri, H. ;

Enomoto, R. ;

Hanafusa, R. ;

Hosokawa, M. ;

Itoh, Y. ;

Muraishi, H. ;

Nakayama, K. ;

Satoh, K. ;

Takeda, T. ;

Tanaka, M. M. ;

Uchida, T. ;

Watanabe, T. ;

Yanagita, S. ;

Yoshida, T. ;

Umehara, K. .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2015, 804 :25-32

[6] Handy Compton camera using 3D position-sensitive scintillators coupled with large-area monolithic MPPC arrays [J].

Kataoka, J. ;

Kishimoto, A. ;

Nishiyama, T. ;

Fujita, T. ;

Takeuchi, K. ;

Kato, T. ;

Nakamori, T. ;

Ohsuka, S. ;

Nakamura, S. ;

Hirayanagi, M. ;

Adachi, S. ;

Uchiyama, T. ;

Yamamoto, K. .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2013, 732 :403-407

[7] 3D unmanned aerial vehicle radiation mapping for assessing contaminant distribution and mobility [J].

Martin, P. G. ;

Kwong, S. ;

Smith, N. T. ;

Yamashiki, Y. ;

Payton, O. D. ;

Russell-Pavier, F. S. ;

Fardoulis, J. S. ;

Richards, D. A. ;

Scott, T. B. .

INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION, 2016, 52 :12-19

[8]

Ministry of Environment Japan, 2015, PROGR OFF SIT CLEAN

[9] New readout and data-acquisition system in an electron-tracking Compton camera for MeV gamma-ray astronomy (SMILE-II) [J].

Mizumoto, T. ;

Matsuoka, Y. ;

Mizumura, Y. ;

Tanimori, T. ;

Kubo, H. ;

Takada, A. ;

Iwaki, S. ;

Sawano, T. ;

Nakamura, K. ;

Komura, S. ;

Nakamura, S. ;

Kishimoto, T. ;

Oda, M. ;

Miyamoto, S. ;

Takemura, T. ;

Parker, J. D. ;

Tomono, D. ;

Sonoda, S. ;

Miuchi, K. ;

Kurosawa, S. .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2015, 800 :40-50

[10] A performance study of an electron-tracking Compton camera with a compact system for environmental gamma-ray observation [J].

Mizumoto, T. ;

Tomono, D. ;

Takada, A. ;

Tanimori, T. ;

Komura, S. ;

Kubo, H. ;

Matsuoka, Y. ;

Mizumura, Y. ;

Nakamura, K. ;

Nakamura, S. ;

Oda, M. ;

Parker, J. D. ;

Sawano, T. ;

Bando, N. ;

Nabetani, A. .

JOURNAL OF INSTRUMENTATION, 2015, 10

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