Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1978-07-24
1980-09-02
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250368, 250445T, G01T 120
Patent
active
042208602
ABSTRACT:
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.
REFERENCES:
patent: 4039839 (1977-08-01), Carlier et al.
patent: 4068129 (1978-01-01), Rabatin
patent: 4070581 (1978-01-01), Gibbons et al.
patent: 4114042 (1978-09-01), LeMay
patent: 4145610 (1979-03-01), Perilhou
Scintillation Counters, Birks, McGraw-Hill, 1953, pp. 56-61, 121-125.
Luminescence and the Scintillation Counter, Curran, Butterworths Scientific Publications, London, pp. 82-89, 131-135.
Photoeffects in Silicon Surface--Barrier Diodes, Journal of Applied Physics, Luzzolino et al., vol. 33, No. 1, Jan. 1962, pp. 148-155.
Bismuth Germanate: A High-Z Gamma Ray and Charged Particle Detector, Harshaw Chemical Co., Solon, Ohio, pp. 1-6.
Harshaw Scintillation Phosphors, Harshaw Chemical Co., Solon, Ohio, 1975.
Harshaw Chemical Catalog, Other Harshaw Scintillation Phosphors, pp. 20-21, (date unknown).
Carlson Roland W.
Jagatich Carl T.
Ohio Nuclear Inc.
Willis Davis L.
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