Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1976-06-21
1977-08-02
Dixon, Harold A.
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
250390, 250458, G01J 158
Patent
active
040398390
ABSTRACT:
Thorium tetrabromide has been found to exhibit fluorescence and radioluminescence with emission of blue light in the range from 3400 to 4800 A with a maximum around 4000 A in response to electromagnetic waves shorter than 3000 A, whether ultraviolet, X or gamma rays and also in response to energetic charged particle radiation, such as alpha rays, beta rays, protons and heavy ions. Because of the radioactive decay of thorium, there is a background autoluminescence. Crystals of thorium tetrabromide are transparent to its luminescence radiation and are particularly suitable for radiation detectors and measurements, frequency converter, standards, radioisotopic microgenerators of electricity, and the like. They are also useable as neutron flux detectors, for thermal and fast neutrons because the component elements of the crystal react with neutrons to respectively produce neutrons activation reactions and fission reactions.
REFERENCES:
patent: 3030509 (1962-04-01), Carlson
patent: 3408302 (1968-10-01), Borchardt
patent: 3408303 (1968-10-01), Borchardt
Carlier Roger
Genet Michel
Hussonois Michel
Krupa Jean-Claude
Agence Nationale de Valorisation de la Recherche (ANVAR)
Dixon Harold A.
Woodward William R.
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