Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1980-05-21
1983-06-21
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250361R, 250391, 376257, G01T 122
Patent
active
043895689
ABSTRACT:
A method is provided for monitoring irradiated nuclear fuel inventories located in a water-filled storage pond wherein the intensity of the Cerenkov radiation emitted from the water in the vicinity of the nuclear fuel is measured. This intensity is then compared with the expected intensity for nuclear fuel having a corresponding degree of irradiation exposure and time period after removal from a reactor core. Where the nuclear fuel inventory is located in an assembly having fuel pins or rods with intervening voids, the Cerenkov light intensity measurement is taken at selected bright spots corresponding to the water-filled interstices of the assembly in the water storage, the water-filled interstices acting as Cerenkov light channels so as to reduce cross-talk. On-line digital analysis of an analog video signal is possible, or video tapes may be used for later measurement using a video editor and an electrometer. Direct measurement of the Cerenkov radiation intensity also is possible using spot photometers pointed at the assembly.
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R. Hesp, "The Feasibility of Using a Liquid-filled Cerenkov Counter for Gamma-ray Counting of Large Samples," Phys. Med. Biol., 23 (3), May 1978, pp. 438-445.
Caldwell John T.
Dowdy Edward J.
Nicholson Nicholas
Fields Carolyn E.
Smith Alfred E.
The United States of America as represented by the United States
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