Radiant energy – Invisible radiation responsive nonelectric signalling – Optical change type
Patent
1988-08-25
1989-09-05
Fields, Carolyn E.
Radiant energy
Invisible radiation responsive nonelectric signalling
Optical change type
2504721, G01T 102
Patent
active
048641448
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.
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DL-M4 Dosimeter, description dated 04-22-87.
Al-Sheikhly Mohamed I.
Chappas Walter J.
Farahani Mahnaz
McLaughlin William L.
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