Speaker
Mr
Takamasa Miura
(Waseda University)
Description
The performance of a large-area, monolithic Hamamatsu Multi-Pixel Photon Counter(MPPC) was tested consisting of a 2x2 array of 3x3 mm2 pixels. MPPC is a novel type of semiconductor photodetector comprising multiple avalanche photodiode (APD) pixels operated in Geiger mode. Despite its great advantage of signal multiplication comparable to that achieved with the photomultiplier tube (PMT), the detection of weak scintillation light signals is quite difficult due to the severe ontamination of dark counts, which typically amounts to ' 1 Mcps/3x3mm2 at room temperature. In this study, a coincidence technique was applied for scintillation detectors to improve the detection efficiency for low energy gamma-rays. The detector consisted of a 10x10x10 mm3 crystals of GSO, BGO and Pr:LuAG optically coupled with the 2x2 MPPCarray. With this technique, we demonstrated that the contamination of dark counts was reduced with 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.
Preferred medium (Oral/poster)
poster
Primary author
Mr
Takamasa Miura
(Waseda University)
Co-authors
Prof.
Jun Kataoka
(Waseda University)
Mr
Kato Takuya
(Waseda University)
Mr
Kazuhisa Yamamura
(Hamamatsu Photonics K. K.)
Mr
Kenichi Sato
(Hamamatsu Photonics K. K.)
Mr
Nobuyuki Kawabata
(Hamamatsu Photonics K. K.)
Dr
Takeshi Nakamori
(Waseda University)
Mr
Yoshitaka Ishikawa
(Hamamatsu Photonics K. K.)
