Gamma ray spectroscopy and timing using LSO and PIN photodiodes

Conference · Tue Nov 01 04:00:00 EST 1994

OSTI ID:10117857

Moses, W W; Derenzo, S E ^[1]; Melcher, C L; Manente, R A ^[2]

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1. Lawrence Berkeley Lab., CA (United States)
2. Schlumberger-Doll Research, Ridgefield, CT (United States)

The high density, high light output, and short decay time of LSO (lutetium orthosilicate, Lu{sub 2}SiO{sub 5}: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 photomultiplier tube) reduces their appeal. In this work the authors measure the gamma ray energy resolution, timing accuracy, and conversion factor from gamma energy to number of electron-hole pairs produced with a 3 x 3 x 22 mm{sup 3} LSO scintillator crystal read out with a 3 x 3 mm{sup 2} silicon PIN photodiode. When the detector is excited with 511 keV photons, a photopeak centered at 1,940 e{sup {minus}} with 149 keV fwhm is observed and a timing signal with 35 ns fwhm jitter is produced. When the detector is excited with 1,275 keV photons, a photopeak centered at 4,910 e{sup {minus}} with 149 keV fwhm is observed and a timing signal with 25 ns fwhm jitter is produced. While these performance measures are inferior to those obtained with photomultiplier tubes, they are acceptable for some applications.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Insts. of Health, Bethesda, MD (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10117857
• Report Number(s): LBL--36272; CONF-9411173--3; ON: DE95006565; CNN: Grant P01-HL25840; R01-CA48002; R01-NS29655
• Country of Publication: United States
• Language: English

Related Subjects

440103
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550601
62 RADIOLOGY AND NUCLEAR MEDICINE
GAMMA RADIATION
GAMMA SPECTROMETERS
NUCLEAR SPECTROSCOPIC INSTRUMENTATION
PERFORMANCE TESTING
POSITRON COMPUTED TOMOGRAPHY
READOUT SYSTEMS
SCINTILLATION COUNTING
SCINTILLATOR-PHOTODIODE DETECTORS
TIMING PROPERTIES
UNSEALED RADIONUCLIDES IN DIAGNOSTICS