Gamma ray spectroscopy and timing using LSO and PIN photodiodes

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Abstract
Particle physics, even with multi-anode or position sensitive photomultiplier tubes, as these devices have a large non- photosensitive area at the perimeter, significant cross-talk, and are significantly more expensive than conventional photomultiplier tubes. The high density, high light output, and short decay time of LSO (lutetium orthosilicate, Lu2SiO5:Ce) make it an attractive scintillator for gamma ray spectroscopy. The low cost, small size, high quantum efficiency, and ruggedness of silicon photodiodes make them attractive photodetectors for this same application, although their high noise (compared to a photomultiplie r tube) reduces their appeal. In this work we measure the gamma ray energy resolution, timing accuracy, and conversion factor from gamma energy to number of electron-hole pairs produced with a 3x3x22 mm3 LSO scintillator crystal read out with a 3x3 mm 2 silicon PIN photodiode. When the detector is excited with 511 keV photons, a photopeak centered at 1940 e- with 149 keV fwhm is observed and a timing signal with 35 ns fwhm jitter is produced. When the detector is excited with 1275 keV photons, a photopeak centered at 4910 e- with 149 keV fwhm

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