Fiber optic dosimeter system using electron trapping materials

Details Fiber optic dosimeter system using electron trapping materials Fiber optic dosimeter system using electron trapping materials

1988-12-08

1991-07-09

Fields, Carolyn E.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

250368, G01T 110

Patent

active

050308343

ABSTRACT:
A fiber optic dosimeter in which an electron trapping material is coated onto a tip of an optical fiber. The tip is placed in a region where radiation is to be measured, and the opposite end of the optical fiber, from which radiation readings are measured, is placed in a location remote from the radiation source. When radiation impinges upon the electron trapping material, electrons in the material are raised to a higher state where they are trapped and stay indefinitely. When infrared light strikes the material, the stored electrons are released from their traps and, upon falling to a lower energy level, emit visible light which can be detected and measured. Thus, to measure the amount of ambient radiation, the electron trapping material is stimulated with infrared light from an infrared source at the opposite end of the optical fiber. This infrared stimulation releases trapped electrons and causes the emission of visible light, at least a portion of which is collected and directed back down the optical fiber to the visible light detector, where it is converted into an electrical signal and measured.

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patent: 4822520 (1989-04-01), Lindmayer
patent: 4855603 (1989-08-01), Lindmayer
P. Braunlich et al., "A Remote Fibre-Optic Microdosimetry Reader", Radiation Protection Dosimetry, vol. 6, No. 1-4, pp. 103-107, Nuclear Technology Publishing (1984).

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