2017年
Development of a low-energy high resolution X-ray camera for high-energy gamma photon background environments
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
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- 巻
- 54
- 号
- 9
- 開始ページ
- 933
- 終了ページ
- 939
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1080/00223131.2017.1323690
- 出版者・発行元
- TAYLOR & FRANCIS LTD
Although a high-energy gamma camera can obtain images of 137Cs distribution by detecting the 662-keV gamma photons, its spatial resolution is reduced because high-energy gamma photons penetrate the edge of the pinhole collimator. To solve this problem, we developed a low-energy X-ray camera that detects the characteristic X-ray photons (32-37 keV) that are emitted from 137Cs to obtain high resolution images. We used a 45 x 45 x 1-mm-thick NaI(Tl) scintillator that was encapsulated in 0.1-mm-thick aluminum and optically coupled to a 2-inch square, position sensitive photomultiplier tube (Hamamatsu Photonics, PSPMT: H12700 MOD) as an imaging detector. The imaging detector was encased in a 2-cm-thick tungsten alloy container and a pinhole collimator was attached to its camera head. The spatial resolution and sensitivity were similar to 5mmfull-width at half-maximum and similar to 0.6 cps/MBq for the 1.5-mm pinhole collimator 10 cm from the collimator surface, respectively. We administered 5 MBq of 137Cs to a soybean seedling, imaged the distribution of radionuclides for six hours, and successfully obtained a high resolution image of it with our developed X-ray camera. We believe our camera will be a powerful tool for such 137Cs imaging in plants.
- リンク情報
- ID情報
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- DOI : 10.1080/00223131.2017.1323690
- ISSN : 0022-3131
- eISSN : 1881-1248
- Web of Science ID : WOS:000407644000002