Development of a scintillation detector using a MPPC as an alternative to an APD

T. Miura*, T. Nakamori, J. Kataoka, T. Kato, K. Sato, Y. Ishikawa, K. Yamamura, N. Kawabata

*この研究の対応する著者

研究成果: Article査読

2 被引用数 (Scopus)

抄録

We conducted a study to examine the performance of the multi-pixel photon counter(MPPC). The MPPC is a novel type of semiconductor photodetector consisting of multiple avalanche photodiode (APD) pixels operated in Geiger mode. Whereas the MPPC offers a great advantage in signal multiplication comparable to that achieved by the photomultiplier tube (PMT), the detection of weak scintillation light signals is difficult due to the severe contamination of dark counts. In this study, we first compared the energy resolutions and energy thresholds of a 3 × 3 mm2 MPPC with those of a 3 × 3 mm2 APD as scintillation detectors. The MPPC and APD were optically coupled with 5 × 5 × 5 mm3 scintillation crystals of BGO, Tl:CsI, Pr:LuAG, and YAG. It turned out that the APD had better energy resolutions for 662 keV gamma-rays, while the MPPC had lower energy thresholds as measured using a test pulse. Despite the low energy thresholds, it is difficult for the MPPC to detect low energy gamma-rays due to the contamination of dark counts. Secondly, we applied a coincidence technique to discriminate weak gamma-ray signals from dark counts by using scintillation detectors that consisted of a 2 × 2 MPPC-array optically coupled with 10 × 10 × 10 mm3 crystals of GSO, BGO, and Pr:LuAG. With this technique, we demonstrated that dark counts achieved a rejection efficiency of more than 99.8%. As a result, 22.2 keV gamma-rays were successfully detected with a GSO scintillator as measured at +20°C.

本文言語English
論文番号C02036
ジャーナルJournal of Instrumentation
7
2
DOI
出版ステータスPublished - 2012 2月

ASJC Scopus subject areas

  • 数理物理学
  • 器械工学

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