The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 1989
Filed:
Aug. 25, 1988
William L McLaughlin, Washington, DC (US);
Mohamed I Al-Sheikhly, Gaithersburg, MD (US);
Walter J Chappas, Rockville, MD (US);
Mahnaz Farahani, Gaithersburg, MD (US);
Other;
Abstract
A radiation dosimeter includes an optical waveguide enclosing a radiation-sensitive material that changes color or color intensity with increasing amounts of exposure to high energy ionizing radiation. A light-transparent radiation-transparent light-transmitting member extends along the length of the optical waveguide, and is separated from the radiation-sensitive material by a light-opaque sidewall. Outside the light-transmitting member is a light-opaque shield that permits light to enter distal ends of the waveguide and the light-transmitting member, while permitting light to exit the proximal ends thereof, the light-opaque shield being transparent to high energy ionizing radiation. A light transmission comparator is positioned adjacent the proximal end of the light-transmitting member, the comparator including a plurality of transparent segments of different color or color intensity arranged in an array of consecutive light-to-dark shades, the color or color intensity of each segment being an exact reproduction of an actual dose level coloration that results from exposure of the radiation-sensitive material within the waveguide of a particular dose of radiation, so as to provide for accurate determination of radiation exposure to the optical waveguide under a variety of ambient lighting conditions.