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Title: Gamma ray camera

A gamma ray camera is disclosed for detecting rays emanating from a radiation source such as an isotope. The gamma ray camera includes a sensor array formed of a visible light crystal for converting incident gamma rays to a plurality of corresponding visible light photons, and a photosensor array responsive to the visible light photons in order to form an electronic image of the radiation therefrom. The photosensor array is adapted to record an integrated amount of charge proportional to the incident gamma rays closest to it, and includes a transparent metallic layer, photodiode consisting of a p-i-n structure formed on one side of the transparent metallic layer, and comprising an upper p-type layer, an intermediate layer and a lower n-type layer. In the preferred mode, the scintillator crystal is composed essentially of a cesium iodide (CsI) crystal preferably doped with a predetermined amount impurity, and the p-type upper intermediate layers and said n-type layer are essentially composed of hydrogenated amorphous silicon (a-Si:H). The gamma ray camera further includes a collimator interposed between the radiation source and the sensor array, and a readout circuit formed on one side of the photosensor array. 6 figs.
Inventors:
Issue Date:
OSTI Identifier:
426636
Assignee:
Univ. of California, Oakland, CA (United States) PTO; SCA: 440101; PA: INS-97:002356; EDB-97:028494; SN: 97001724489
Patent Number(s):
US 5,596,198/A/
Application Number:
PAN: 8-231,149
Contract Number:
AC03-76SF00098
Resource Relation:
Other Information: PBD: 21 Jan 1997
Research Org:
University of California
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; GAMMA CAMERAS; DESIGN; VISIBLE RADIATION; PHOTODETECTORS; INORGANIC PHOSPHORS; READOUT SYSTEMS; COLLIMATORS