System for use with solid state dosimeter

Details System for use with solid state dosimeter System for use with solid state dosimeter

1988-06-29

1990-09-04

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

With heating of luminophors

2504841, G01T 1115

Patent

active

049547070

ABSTRACT:
The present invention constitutes a system for determining the amounts of ionizing radiation to which dosimeters using thermoluminescent materials have been exposed. In accordance with this system, the thermoluminescent materials which comprise the dosimeters are first cooled by contact with a cryogenic substance such as liquified nitrogen. The thermoluminescent materials are then optically stimulated by exposure to ultraviolet light. Thereafter, the amounts of visible light emitted by the thermoluminescent materials are detected and counted as the materials are allowed to warm up to room temperature. The amounts of luminescence exhibited by the materials are related to radiation exposure and provide a sensitive measure of radiation dosage. It has been discovered that the above procedure is most effective when heavily doped thermoluminescent materials are used and that the procedure allows many useful plastic materials to now be employed in dosimeter constructions.

REFERENCES:
patent: 3375372 (1968-03-01), Miyashita
patent: 3388252 (1968-06-01), Medlin
patent: 3415990 (1968-12-01), Watson
patent: 3601610 (1971-08-01), Nakamura et al.
patent: 3709663 (1973-01-01), Wendricks
patent: 3835329 (1974-09-01), Moran et al.
patent: 4458154 (1984-07-01), Sugita et al.
Chaudhary et al., "An Apparatus for Phosphorescence Decay and Thermoluminescence Study at Ambient and Liquid Nitrogen Temperature", Cryogenics, vol. 17, No. 7 (Jul. 1977) p. 419.
Tatake et al., "A Variable Temperature Cryostat for Thermoluminescence Studies", J. Phys. E. (GB), vol. 4, No. 10 (Oct. 1971) p. 755.
Sanzelle et al., "Appareillage Destine a l'Etude de la Thermoluminescence Entre 77K et 773K", Revue de Physique Appliquee, vol. 10, No. 1975, pp. 471-473.
Rao et al., "Optically Stimulated Luminescence Dosimetry", Radiation Protection Dosimetry, vol. 6, No. 1-4, pp. 66-66.
Pradhan et al., "Radiation Dosimetry by Photostimulated Luminescence of CaSO:Dy", International Journal of Applied Radiation and Isotopes, vol. 28, 1977, pp. 534-535.

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