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Title: Gamma ray camera

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.

Inventors:
 [1]
  1. (Berkeley, CA)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
OSTI Identifier:
870794
Patent Number(s):
US 5596198
Assignee:
Regents, University of California (Oakland, CA) LBNL
DOE Contract Number:
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
gamma; ray; camera; detecting; rays; emanating; radiation; source; isotope; sensor; array; formed; visible; light; crystal; converting; incident; plurality; corresponding; photons; photosensor; responsive; form; electronic; image; therefrom; adapted; record; integrated; amount; charge; proportional; closest; transparent; metallic; layer; photodiode; consisting; p-i-n; structure; comprising; upper; p-type; intermediate; n-type; preferred; mode; scintillator; composed; essentially; cesium; iodide; csi; preferably; doped; predetermined; impurity; layers; hydrogenated; amorphous; silicon; a-si; collimator; interposed; readout; circuit; intermediate layers; p-type layer; sensor array; structure formed; gamma rays; gamma ray; amorphous silicon; hydrogenated amorphous; visible light; radiation source; intermediate layer; predetermined amount; n-type layer; transparent metal; preferred mode; composed essentially; ray camera; metallic layer; circuit formed; cesium iodide; readout circuit; incident gamma; electronic image; circuit form; /250/

Citation Formats

Perez-Mendez, Victor. Gamma ray camera. United States: N. p., 1997. Web.
Perez-Mendez, Victor. Gamma ray camera. United States.
Perez-Mendez, Victor. Wed . "Gamma ray camera". United States. doi:. https://www.osti.gov/servlets/purl/870794.
@article{osti_870794,
title = {Gamma ray camera},
author = {Perez-Mendez, Victor},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1997},
month = {Wed Jan 01 00:00:00 EST 1997}
}

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