Radiant energy – Invisible radiation responsive nonelectric signalling – Optical change type
Patent
1996-11-25
1998-06-16
Tokar, Michael J.
Radiant energy
Invisible radiation responsive nonelectric signalling
Optical change type
2504752, G01J 102
Patent
active
057675201
ABSTRACT:
A method for determining a level of exposure to radiation utilizes a radiation dosimeter comprising a substrate provided with a radiation sensitive layer or patch having an optical density which varies in accordance with the degree of radiation exposure. In addition, the substrate is provided with optically readable coding which identifies one or more encoded mathematical parameters for enabling an automated calculation of dosage from a detected optical density change of the radiation sensitive material. In the method, the coding on the dosimeter substrate is scanned to automatically determine the encoded mathematical parameters, and a plurality of pre-exposure optical densities and a plurality of post-exposure optical densities of the layer of radiation sensitive material in a plurality of wavelength bands are optically measured. From these quantities, a quantitative radiation dose to which the layer of radiation sensitive material was exposed is automatically computed in accordance with a predetermined mathematical algorithm. Each dosimeter is provided with a unique identification code encoded in the bar coding on the dosimeter substrate, to enable memory storage of pre-exposure optical densities for multiple dosimeters.
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Donahue J. Michael
Lewis David F.
Listl Carl A.
Seiwatz Henry
Davis William J.
Goldberg Jules E.
Hanig Richard
ISP Investments Inc.
Maue Marilyn J.
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