Patent Number: 
Section: claims

1. A 99mTc generator comprising:(a) a body portion having an inlet and an outlet; and(b) an ion exchange housed within said body portion, said ion exchange comprising carbon or graphite fibers impregnated with an acidic organophosphorus extractant selected from the group consisting of DEHPA, EHEHPA, and DTMPPA, and said ion exchange further comprising ions of 99Mo bound to said extractant. 2. A 99mTc generator according to claim 1, further comprising:(c) an aqueous solution having a pH of from about 1 to about 2 within said body portion and in contact with said ion exchange, said aqueous acid solution containing 99mTc that has been produced by radioactive decay of said 99Mo. 3. A 99mTc generator according to claim 2, wherein the pH of said aqueous solution is about 1. 4. A 99mTc generator according to claim 2, wherein the pH of said aqueous solution is about 2. 5. A 99mTc generator according to claim 2, wherein said aqueous solution is selected from the group consisting of hydrochloric acid and nitric acid. 6. A 99mTc generator according to claim 1, wherein said acidic organophosphorus extractant comprises DEHPA. 7. A 99mTc generator according to claim 1, wherein said acidic organophosphorus extractant comprises EHEHPA.