Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1991-10-07
1993-06-01
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
25039001, 2504841, G01T 111, G01T 300, G01T 308
Patent
active
052162494
ABSTRACT:
A neutron detector is formed from a layer of polycrystalline diamond which is deposited by a chemical vapor deposition process. The diamond material contains .sup.10 B as a dopant, in a concentration of 1,000 ppm or less. In one embodiment, the layer of diamond material is deposited on a supporting substrate. Advantageously, the substrate itself may comprise a layer of diamond material. In another embodiment, the substrate comprises a layer of conductive or semiconductive material. The diamond material is deposited on top of the substrate, with at least two regions in contact with the semiconductive material. A central portion of the semiconductive material is etched away, and electrical contacts are applied to the remaining portions of the semiconductive substrate. An advantage of the neutron detector of the invention is that the diamond layer is very thin, less than 50 .mu.m thick, so that the sensitivity of the detector to other radiation, particularly .gamma. radiation, is reduced.
REFERENCES:
patent: 3805078 (1974-04-01), Kozlov
patent: 4754140 (1988-06-01), Nam et al.
patent: 4981818 (1991-01-01), Anthony
patent: 5099296 (1992-03-01), Mort et al.
The Detection of Ionizing Radiations by Natural and Synthetic Diamond Crystals and their Application as Dosimeters in Biological Environments, Keddy, Nam and Burns, published in Carbon, vol. 26, No. 3, pp. 345-356 (1988).
Detector Assembly with a Diamond Detector for Recording Neutrons, by Luchanskii, Martynov, Khrunov, and Chekhlaev, translated from Atomnaya Energiya, vol. 53, No. 2, pp. 132-133 (1987).
Synthetic Diamonds as Dosimeters in Biological Environments, by R. J. Keddy, pp. 1-16, chapter of Advances in Ultrahard Materials, vol. 4, edited by Chris Barrett, De Beers Industrial Diamond Division.
Jones Barbara L.
Keddy Rex J.
Nam Tom L.
De Beers Industrial Diamond Division (Proprietary) Limited
Fields Carolyn E.
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