DR. RICHARD ISAAC LEVY, M.D.
Osteopathic Medicine at Huntington Ave, Boston, MA

4107537, Aug 15, 1978

Oct 12, 1976

5/731587

Harold K. Forsen - Bellevue WA
George Sargent Janes - Lincoln MA
Richard H. Levy - Boston MA

Jersey Nuclear-Avco Isotopes, Inc. - Bellevue WA

H01J 3934

250423P

Method and apparatus for impact ionization of particles excited with isotopic selectivity, particularly for use in a system of uranium isotope separation and enrichment. Efficient impact ionization is achieved by first selectively exciting vaporized particles of the desired isotope in a beam of finely tuned laser radiant energy. The energies of the interacting photons are selected to produce a total energy shift during excitation which is slightly less than the ionization energy for the selected isotope. The excited isotope will thus be raised to an excitation level only slightly below the ionization level. This level is selected to permit efficient ionization, particle collisional ionization, between energetic particles in the uranium vapor environment and the highly excited particles of the desired isotope type.

4217494, Aug 12, 1980

Feb 2, 1973

5/328967

Richard H. Levy - Boston MA

Jersey Nuclear-Avco Isotopes, Inc. - Bellevue WA

H01J 3934

250282

Method and apparatus for isotope separation by selective ionization of a desired isotope in an environment of plural isotopes without corresponding ionization of the other isotopes in the environment. The selective ionization is achieved through a three step excitation of atoms of the desired isotope in response to laser radiations applied to the environment. The transition for each step is selected to be less than one half the ionization potential for the isotopes to avoid two step nonselective ionization.

3944825, Mar 16, 1976

Feb 2, 1973

5/328953

Richard H. Levy - Boston MA
George Sargent Janes - Lincoln MA

Jersey Nuclear-Avco Isotopes, Inc. - Bellevue WA

H01J 3934

250282

In a system for isotope enrichment, method and apparatus for separating particles of one isotope type from an environment containing particles of plural isotope types by ionizing the particles of said one isotope type and imparting to the electrons released from the ionized particles an energy substantially in excess of the thermal or background energy of the environment whereby these super energetic electrons expand away from the environment in the company of the corresponding ionized particles or trajectories substantially different from those of the remaining particles in the environment to permit separate collection of the particles of the one isotope type.

4009391, Feb 22, 1977

Jun 25, 1974

5/482866

George Sargent Janes - Lincoln MA
Richard H. Levy - Boston MA
Lawrence A. Levin - Beer Sheva, IL

Jersey Nuclear-Avco Isotopes, Inc. - Bellevue WA

H01J 3708, H01J 3934

250281

Frequency selective means, particularly for use in uranium enrichment by laser induced isotopically selective ionization to suppress unwanted lasing of the excited uranium medium. The frequency selective means, such as filters, are placed at intervals in a column of laser illuminated uranium vapor and are transmissive to the illuminating laser frequencies but nontransmissive to frequencies at which population inversions exist in the excited uranium. The filters limit the path length and correspondingly the gain in the excited uranium to prevent high intensity lasing by the uranium itself.