Nuclear reactivity control using laser induced polarization
Patent 4976911 Issued on December 11, 1990. Estimated Expiration Date: 
May 26, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 26, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3227619 3309284 3629068 3868593 3878479 Fission fragment excited laser system Gas laser with sputter-resistant cathode Patent #: 4017808 InventorAssigneeApplicationNo. 357248 filed on 05/26/1989US Classes:376/221, Variable fluent reflector/moderator level or density376/326, With laser376/331Gaseous control componentExaminersPrimary: Behrend, Harvey E.Attorney, Agent or FirmForeign Patent References
International ClassG21C 007/06AbstractA control element for reactivity control of a fission source provides an atomic density of 3 He in a control volume which is effective to control criticality as the 3 He is spin-polarized. Spin-polarization of the 3 He affects the cross section of the control volume for fission neturons and hence, the reactivity. An irradiation source is directed within the 3 He for spin-polarizing the 3 He. An alkali-metal vapor may be included with the 3 He where a laser spin-polarizes the alkali-metal atoms which in turn, spin-couple with 3 He to spin-polarize the 3 He atoms.Other References
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