Speaker
Dr
Takeshi Nakamori
(Waseda University)
Description
We have developed a new type of large-area monolithic Multi-Pixel Photon Counter (MPPC) array consisting of a 4x4 matrix of 3x3 mm^2 pixels. Each pixel comprises 3600 Geiger mode avalanche photodiodes that achieve an average gain up to 10^6 with variations of only +/- 7% over 4x4 pixels. Excellent uniformity was also obtained for photon detection efficiencies (PDE) of +/-6%. We fabricated a prototype gamma-ray camera consisting of an MPPC array optically coupled with a scintillator matrix, namely a 4x4 array of 3x3x10 mm^3 crystals. Then we tested the performance with Ce-doped LYSO, Pr-doped LuAG and surface coated Pr:LuAG matrices whereby the emission peak of Pr:LuAG was shifted from 310 to 420 nm via a wavelength shifter. An average FWHM energy resolution of ~10% were obtained for 662 keV gamma-rays, as measured at 0 degree with each scintillator matrix. Besides, in order to reduce the number of readout channels, we employed a chargedivision readout technique with a resistors' matrix. We present that reconstructed gamma-ray events were nicely resolved in each pixels without deterioration in energy resolutions. These results suggest that a large-area monolithic MPPC array developed here could be promising detector especially for positron emission tomography.
Preferred medium (Oral/poster)
Oral
Author
Dr
Takeshi Nakamori
(Waseda University)
Co-authors
Mr
Hidenori Matsuda
(Waseda University)
Dr
Jun Kataoka
(Waseda University)
Dr
Kei Kamada
(Furukawa Co. Ltd.)
Mr
Kenichi Sato
(Hamamatsu Photonics K. K.)
Mr
Takamasa Miura
(Waseda University)
Mr
Takuya Kato
(Waseda University)
