Fiber optic radiation monitor

Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor

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250367, G01T 120, G01T 1203

Patent

active

053130650

ABSTRACT:
Scintillating optical fiber is used in a probe for detecting radiation. The scintillating optical fiber is fused to an extension fiber leading to optoelectronics such as p-intrinsic n-photodiodes or avalanche photodiodes. The fibers are housed in a durable probe body for penetration into the ground. When radiation is present, dopants in the scintillating fiber emit visible light through the extension fiber to the optoelectronics. Amplifiers are provided for monitoring the light intensity transmitted along the fibers and for triggering an alarm circuit signaling the presence of radiation at the probe.

REFERENCES:
patent: 4267446 (1981-05-01), Brown et al.
patent: 4361765 (1982-11-01), Franks et al.
patent: 4598202 (1986-07-01), Koechner
patent: 4788436 (1988-11-01), Koechner
patent: 4931646 (1990-06-01), Koechner
Chiles et al., `Multi-Energy Nuetron Detector for Counting Thermal Neutrons, High-Energy Neutrons, and Gamma Photons Separately`, IEEE Transactions on Nuclear Science, vol. 37, No. 3, Jun. 1990, pp. 1348-1350, USCL 250/390.11
Kozlov et al, `A Scintillator Based on Hexafluorobenzene`; Plenum Publishing Corp., 1975, pp. 737-739, USCL 250/486.1.
Technical Proposal, "Development of a Long Term Post Closure Radiation Monitor" USDOE, Dec. 13, 1991.
Bicron Corp. Sales Brochure BCF-28 "Green Plastic Scintillating Fiber" Nov., 1990.

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