Journal Article <論文・報告>放射線計測のためのPIN フォトダイオードとアバランシェフォトダイオードの性能評価

芝内, 菜緒  ,  徳地, 研人  ,  生駒, 洋樹  ,  越川, 亜美  ,  村田, 求基  ,  古野, 達也  ,  津村, 美保  ,  川畑, 貴裕

1pp.32 - 35 , 2016-03 , 京都大学学際融合教育研究推進センター高大接続科学教育ユニット
理学 物理学
Scintillation detectors are widely used for measuring radiation. A scintillation detector is composed of a photodetector and a scintillator that emits photons when it absorbs ionizing radiation. A PIN photodiode is a kind of photodetector which has been used conventionally. An avalanche photodiode (APD) is another kind of photodetector that has come into use recently. Since the APD can amplify the photocurrent by applying a high reverse voltage, output signals from the APD are less likely to be affected by background noise than those from the PIN photodiode. We have evaluated the performance of scintillation detectors with either an APD or PIN photodiode based on energy resolution, linearity, and long-term stability. We found that the energy resolution of the APD is about twice as good as that of the PIN photodiode, and that the linearity of both detectors is equally good. The instability of the PIN photodiode was less than 2% after 7 hours, which was a factor of three smaller than that of the APD. We believe that the APD instability is due to temperature variation. In conclusion, scintillation detectors with an APD are useful for high-resolution spectroscopy of ionizing radiation if their temperature is properly controlled.

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