A bismuth germanate-avalanche photodiode module designed for use in high resolution positron emission tomography
A light-tight, hermetically sealed module for use in high resolution positron emission tomography systems is described. The module has external dimensions 3.8 x 13.2 x 33 mm and contains two 3 x 5 x 20 Bismuth Germanate (BGO) scintillators, each with its own 3 x 3 mm silicon avalanche photodiode. When stacked, the vertical packing fraction is 80%. As measured with a /sup 137/Cs (662 keV) source, the typical energy resolution is 20% at 22/sup 0/C, reducing to 16% at 0/sup 0/C. The single detector time resolution for the /sup 22/Na gamma at 511 keV is typically less 20 ns at 22/sup 0/C, reducing to less than 15 ns at 0/sup 0/C. Further cooling does not improve the performance since the emission time of light from BGO increases at lower temperature. Preliminary results with Gadolinium Orthosilicate show similar energy resolution, better timing resolution (under 10 ns), but as is known, a slightly poorer photofraction and stopping power.
- Research Organization:
- RCA, Inc., Box 1200, New Products Div., Ste-Anne-de-Bellevue, Quebec
- OSTI ID:
- 5805727
- Report Number(s):
- CONF-851009-
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Vol. NS-33:1; Conference: IEEE nuclear science symposium, San Francisco, CA, USA, 23 Oct 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BGO DETECTORS
PERFORMANCE
POSITRON COMPUTED TOMOGRAPHY
AVALANCHE QUENCHING
CESIUM 137
COOLING
ENERGY RESOLUTION
KEV RANGE 100-1000
MEDIUM TEMPERATURE
PHOTODIODES
SODIUM 22
STOPPING POWER
TIME RESOLUTION
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CESIUM ISOTOPES
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
ENERGY RANGE
ISOTOPES
KEV RANGE
LIGHT NUCLEI
MEASURING INSTRUMENTS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIATION DETECTORS
RADIOISOTOPES
RESOLUTION
SCINTILLATION COUNTERS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SODIUM ISOTOPES
SOLID SCINTILLATION DETECTORS
TIMING PROPERTIES
TOMOGRAPHY
YEARS LIVING RADIOISOTOPES
550602* - Medicine- External Radiation in Diagnostics- (1980-)
440101 - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments