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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 1,091 - 1,097 (7page)
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초록· 키워드
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After the Fukushima accident in 2011, there has been increased public concern about radioactivecontamination of water resources through fallout in neighboring countries. However, there is still noavailable initial response system that can promptly detect radionuclides. The purpose of this research isto develop the most efficient gamma spectrometer to monitor radionuclides in an aquatic environment. We chose a thallium-doped sodium iodide (NaI(Tl)) scintillator readout with a silicon photo multiplier(SiPM) due to its compactness and low operating voltage. Three types of a scintillation detector weretested. One was composed of a scintillator and a photomultiplier tube (PMT) as a reference; anothersystem consisted of a scintillator and an array of SiPMs with a light guide; and the other was a scintillatordirectly coupled with an array of SiPMs. Among the SiPM-based detectors, the direct coupling systemshowed the best energy resolution at all energy peaks. It achieved 9.76% energy resolution for a 662 keVgamma ray. Through additional experiments and a simulation, we proved that the light guide degradedenergy resolution with increasing statistical uncertainty. The results indicated that the SiPM-basedscintillation detector with no light guide is the most efficient design for monitoring radionuclides inan aquatic environment.
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