Lutetium orthosilicate single crystal scintillator detector

Details Lutetium orthosilicate single crystal scintillator detector Lutetium orthosilicate single crystal scintillator detector

1989-08-04

1990-09-18

Cooper, Jack

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

250361R, 2523014F, C09K 1179, G01J 158

Patent

active

049580809

ABSTRACT:
A scintillator for use as a gamma ray or like radiation detector is composed of a single crystal of cerium-activated lutetium oxyorthosilicate having the general formulation Ce.sub.2x Lu.sub.2(1-x) SiO.sub.5. In a borehole logging application, the detector is mounted in a logging sonde with a high energy neutron source, for movement through a borehole traversing earth formations. Gamma radiation from the surrounding formations is detected and analyzed to provide information concerning hydrocarbons in the formations.

REFERENCES:
patent: 4208611 (1980-06-01), Watanabe et al.
patent: 4647781 (1987-03-01), Takagi et al.
"Serie Isomorphe d'Orthosilicates (T.sub.2 SiO.sub.5) et d'Orthogermanates (T.sub.2 GeO.sub.5) De Terres Rares", Buisson et al., Mat. Res. Bull. vol. 3, pp. 193-198, 1968.
"Preparation and Cathodoluminescence of Ce.sup.3+ -Activated Yttrium Silicates and Some Isostructural Compounds", A. H. Gomes de Mesquita et al., Mat. Res. Bull. vol. 4, pp. 643-650, 1969.
"Growth of Lanthanide Oxyorthosilicate Single Crystals, and Their Structural and Optical Characteristics", G. V. Anan'eva et al., Translated from Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy, vol. 17, No. 6, pp. 1037-1042, Jun. 1981.
"Site Selectively Excited Luminescence of Eu.sup.3+ IN Gadolinium, Yttrium and Lutetium Oxyorthosilicates", Holsa et al., Journal of the Less-Common Metals, 126 (1986) 215-220.
"Cerium-Activated Gd.sub.2 SiO.sub.5 Single Crystal Scintillator", Takagi et al., Appl. Phys. Lett., vol. 42, No. 1, 1 Jan. 1983, pp. 43-45.
"Czochralski Growth of Rare-Earth Orthosilicates (Ln.sub.2 SiO.sub.5)", Brandle et al., Journal of Crystal Growth 79 (1986) pp. 308-315.
"Sol-Gel Deposition of Tb.sup.3+ :Y.sub.2 SiO.sub.5 Cathodoluminescent Layers", Rabinovich et al., Am. Ceram. Soc. Bull. 66[10] 1505-09 (1987).
"Characteristic Luminescence", Blasse et al., Philips Technical Review, vol. 31, 1970, No. 10.
"Development of New Scintillation Crystal Gd.sub.2 SiO.sub.5 : Ce for Gamma-Ray Detection", Ishii et al., submitted to 4th Experts Meeting on Positron CT between AIST Japan and STU Sweden, Stockholm, Mar. 17-20, 1986.

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