Michael Dee Pope

US Patent:

20030157012, Aug 21, 2003

Filed:

Jan 16, 2003

Appl. No.:

10/220021

Inventors:

Michael Pope - Washington DC, US
Alexei Besserguenev - Washington DC, US

International Classification:

C01G045/04

US Classification:

423/417000, 423/002000, 423/049000

Abstract:

Novel stable forms of technetium and methods for their production are provided. These methods have particular application for the removal of technetium from industrial waste compositions.

US Patent:

56184727, Apr 8, 1997

Filed:

Sep 13, 1994

Appl. No.:

8/305183

Inventors:

Michael T. Pope - Washington DC
Inge I. Creaser - Scott Creek, AU
Mark C. Heckel - East Hampton MA

Assignee:

Georgetown University - Washington DC

International Classification:

C09K 1104

US Classification:

252625

Abstract:

Anions of the formula (I): [DA. sub. 5 M. sub. 30-x O. sub. 110-x (M'L). sub. x ]. sup. m- (I) in which D is Na. sup. +, Ca. sup. 2+ ; A is P, As, Sb, Si, Ge, or combinations thereof, M is W. sup. 5+, W. sup. 6+, or mixtures thereof; M' is a metallic element from groups 2 to 15 of the periodic table; other than W; L is O. sup. 2-, OH. sup. -, H. sub. 2 O; x is 0-10; and m is 10-20; selectively react with cations Z. sup. n+ to afford anions of the formula (II): [ZA. sub. 5 M. sub. 30-x O. sub. 110-x (M'L). sub. x ]. sup. (m+1-n)-(II) wherein n is 3 or 4; Z=Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, or Bi, when n=3, and Z=Ce, U, Np, Pu, or Am, when n =4. This reaction may be used for the selective encapsulation of lanthanide or actinide cations, and salts containing anions of formula (II) may be vitrified to form glasses or reduced to form tungsten "bronze" materials suitable for the long-term storage of radioactive lanthanides or actinides.

US Patent:

53645685, Nov 15, 1994

Filed:

Jul 8, 1992

Appl. No.:

7/910532

Inventors:

Michael T. Pope - Washington DC
Inge I. Creaser - Scott Creek, AU
Mark C. Heckel - East Hampton MA

Assignee:

Georgetown University - Washington DC

International Classification:

G21F 916

US Classification:

588 18

Abstract:

Anions of the formula (I): [DA. sub. 5 M. sub. 30-x O. sub. 110-x (M'L). sub. x ]. sup. m- (I) in which D is Na. sup. +, Ca. sup. 2+; A is P, As, Sb, Si, Ge, or combinations thereof M is W. sup. 5+, W. sup. 6. alpha. , or mixtures thereof; M' is a metallic element from groups 2 to 15 of the periodic table; other than W; L is O. sup. 2-, OH. sup. -, H. sub. 2 O; x is 0-10; and m is 10-20; selectively react with cations Z. sup. n+ to afford anions of the formula (II): [ZA. sub. 5 M. sub. 30-x O. sub. 110-x (M'L). sub. x ]. sup. (m+1-n)- (II) wherein n is 3 or 4; Z=Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, or Bi, when n=3, and Z=Ce, U, Np, Pu, or Am, when n=4. This reaction may be used for the selective encapsultion of lanthanide or actinide cations, and salts containing anions of formula (II) may be vitrified to form glasses or reduced to form tungsten "bronze" materials suitable for the long-germ storage of radioactive lanthanides or actinides.