Development of an omnidirectional gamma-ray imaging Compton camera for low-radiation-level environmental monitoring
| Autor: | Hiroshi Muraishi, Kiyoto Wada, Ryoji Enomoto, Hideaki Katagiri, Takara Watanabe, Souichi Tanaka, Ryo Wakamatsu, Daisuke Kano, M. Kagaya, Tomohisa Uchida, Manobu Tanaka, Wataru Satoh, Tohoru Takeda, Masahiro Fukushi |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Physics and Astronomy (miscellaneous) 010308 nuclear & particles physics business.industry General Engineering Gamma ray General Physics and Astronomy Compton camera Scintillator Radiation 01 natural sciences Optics 0103 physical sciences Environmental monitoring Angular resolution business Omnidirectional antenna 010303 astronomy & astrophysics Energy (signal processing) |
| Zdroj: | Japanese Journal of Applied Physics. 57:026401 |
| ISSN: | 1347-4065 0021-4922 |
| Popis: | We have developed an omnidirectional gamma-ray imaging Compton camera for environmental monitoring at low levels of radiation. The camera consisted of only six CsI(Tl) scintillator cubes of 3.5 cm, each of which was readout by super-bialkali photo-multiplier tubes (PMTs). Our camera enables the visualization of the position of gamma-ray sources in all directions (~4π sr) over a wide energy range between 300 and 1400 keV. The angular resolution (σ) was found to be ~11°, which was realized using an image-sharpening technique. A high detection efficiency of 18 cps/(µSv/h) for 511 keV (1.6 cps/MBq at 1 m) was achieved, indicating the capability of this camera to visualize hotspots in areas with low-radiation-level contamination from the order of µSv/h to natural background levels. Our proposed technique can be easily used as a low-radiation-level imaging monitor in radiation control areas, such as medical and accelerator facilities. |
| Databáze: | OpenAIRE |
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