Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1984-06-25
1986-05-06
Lee, John
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
2505061, 350 11, 350 9634, G02B 514
Patent
active
045867852
ABSTRACT:
The addition of a getter consisting essentially of reactive oxides of boron and silicon, to a melt of an alkali metal halide serves to overcome problems of unacceptable color, afterglow and hardness attributable to trace impurities present in the melt. These trace impurities are generally metals present in a concentration less than 1 part per million (ppm) parts of melt. An ingot melt-grown from charge stock treated with the getter provides high quality optical bodies such as light pipes, laser windows and scintillators. Specific problems characteristic of a scintillator ingot grown from a highly purified alkali metal halide "remelt", such as is obtained by crushing and melting portions of a melt-grown ingot, are overcome by adding to the remelt a portion of fresh powder stock in which the getter has been uniformly distributed. A process is taught for the Stockbarger growth of a scintillator ingot from a charge stock treated to include a getter consisting essentially of the combined reactive oxides of boron and silicon, comprising superheating a melt of treated charge stock for a period of time sufficient to react at least some of the reactive oxides with deleterious trace impurities present in the melt, and growing a scintillator ingot free from discoloration, afterglow or undue hardness due to the presence of the impurities.
REFERENCES:
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patent: 4341654 (1982-07-01), Swinehart
patent: 4381141 (1983-04-01), Sakuragi et al.
patent: 4449780 (1984-05-01), Swinehart
Okamura et al., "CsI Crystalline Fiber for Infrared Transmission", Japanese J. of Applied Physics, vol. 19, No. 10, Oct. 1980, pp. L649-L651.
Harshaw/Filtrol Partnership
Lee John
Lucas James A.
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