Large-area PSPMT based gamma-ray imager with edge reclamation

Conference · Thu Sep 21 04:00:00 EDT 2000 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/NSSMIC.2000.949117· OSTI ID:15004016

Ziock, K-P; Nakae, L

We describe a coded aperture, gamma-ray imager which uses a CsI(Na) scintillator coupled to an Hamamatsu R3292 position-sensitive photomultiplier tube (PSPMT) as the position-sensitive detector. We have modified the normal resistor divider readout of the PSPMT to allow use of nearly the full 10 cm diameter active area of the PSPMT with a single scintillator crystal one centimeter thick. This is a significant performance improvement over that obtained with the standard readout technique where the linearity and position resolution start to degrade at radii as small as 3.5 cm with a crystal 0.75 crn thick. This represents a recovery of over 60% of the PSPMT active area. The performance increase allows the construction of an imager with a field of view 20 resolution elements in diameter with useful quantum efficiency from 60-700 keV. In this paper we describe the readout technique, its implementation in a coded aperture imager and the performance of that imager.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 15004016
• Report Number(s): UCRL-JC-138661
• Conference Information: Journal Name: IEEE Transactions on Nuclear Science Journal Volume: 1
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
APERTURES
CONSTRUCTION
ENGINEERS
IMPLEMENTATION
PERFORMANCE
PHOSPHORS
PHOTOMULTIPLIERS
POSITION SENSITIVE DETECTORS
QUANTUM EFFICIENCY
RESISTORS
RESOLUTION