Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1994-04-22
1997-01-21
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
25036302, 250366, 25037009, G01T 1164, G01T 1202
Patent
active
055961983
ABSTRACT:
A gamma ray camera 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.
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H. Lee et al., "Hydrogenated Amorphous Silicon (a-Si:H) Based Gamma Camera--Monte Carlo Simulations", Jan. 1994, Lawrence Berkley Laboratory, LBL-35050.
Bon Kathleen Dal
Fields Carolyn E.
Martin Paul R.
Ross Pepi
The Regents University of California
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