Tomographic scanner with cadmium tungstate scintillation crystals
Patent
·
OSTI ID:6921309
A radiation detector suitable for use in tomographic scanners comprising at least one cadmium tungstate scintillation crystal optically coupled with a silicon photodiode or other photoelectric transducers. A plurality of cadmium tungstate crystals may be coupled to one silicon photodiode with fiber optic light guides. In a tomographic scanner, radiation passing through the scan circle impinges on the cadmium tungstate crystals causing them to scintillate. The light scintillated strikes the area of the p-n junction of the photodiode causing the photoelectric effect to be manifested. The intensity of radiation striking the crystal is determined by measuring the photoconductive conductance, photoemissive current or photovoltaic potential. From these intensities an image is computed of the radiation attenuation in the examined scan circle.
- Assignee:
- Ohio Nuclear Inc
- Patent Number(s):
- US 4220860
- OSTI ID:
- 6921309
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
CADMIUM COMPOUNDS
CADMIUM TUNGSTATES
CURRENTS
DIAGNOSTIC TECHNIQUES
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
FIBER OPTICS
IMAGE SCANNERS
INORGANIC PHOSPHORS
JUNCTIONS
MEASURING INSTRUMENTS
P-N JUNCTIONS
PHOSPHORS
PHOTOCONDUCTIVITY
PHOTODIODES
PHOTOELECTRIC EFFECT
PHYSICAL PROPERTIES
RADIATION DETECTORS
SCINTILLATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SEMICONDUCTOR JUNCTIONS
TOMOGRAPHY
TUNGSTATES
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
CADMIUM COMPOUNDS
CADMIUM TUNGSTATES
CURRENTS
DIAGNOSTIC TECHNIQUES
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
FIBER OPTICS
IMAGE SCANNERS
INORGANIC PHOSPHORS
JUNCTIONS
MEASURING INSTRUMENTS
P-N JUNCTIONS
PHOSPHORS
PHOTOCONDUCTIVITY
PHOTODIODES
PHOTOELECTRIC EFFECT
PHYSICAL PROPERTIES
RADIATION DETECTORS
SCINTILLATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SEMICONDUCTOR JUNCTIONS
TOMOGRAPHY
TUNGSTATES