Patent Number: 039705838
Section: claims

1. In an isotope generator for the production of liquids containing 99 mTc which generator is provided with a reservoir having an inlet opening and an outlet opening and a parent isotope 99 mMo in the form of a molybdate on a carrier material located in said reservoir the improvement wherein the carrier material contains Al.sub.2 O.sub.3 and at least partially hydrated manganese dioxide. 2. The isotope generator of claim 1 wherein the carrier material is in the form of Al.sub.2 O.sub.3 particles at least a fraction of which is at least partially coated with at least partially hydrated manganese dioxide. 3. The isotope generator of claim 2 wherein for each gram of Al.sub.2 O.sub.3 from 1.5 to 4 mgs of manganese in the form of at least partially hydrated manganese dioxide is present. 4. In an isotope generator for the production of liquids containing 99 mTc which generator is provided with an inlet opening and an outlet opening and a parent isotope 99 mMo in the form of a molybdate on a carrier material located in said reservoir the improvement wherein the carrier material consists of an upper layer at the side of the inlet opening containing Al.sub.2 O.sub.3 particles at least partially coated with a layer of at least partially hydrated manganese dioxide and a lower layer situated at the side of the outlet opening consisting of Al.sub.2 O.sub.3 particles. 5. The isotope generator of claim 4 wherein 30-60% by weight of the carrier material is present in the upper layer. 6. The isotope generator of claim 4 wherein in the upper layer of the carrier material for each gram of Al.sub.2 O.sub.3 there is present from 1.5 to 4 mg of manganese in the form of at least partially hydrated manganese dioxide. 7. The isotope generator of claim 6 wherein for each gram of Al.sub.2 O.sub.3 from 2.2 to 3 mg of manganese in the form of at least partially hydrated manganese dioxide is present. 8. The isotope generator of claim 4 wherein the reservoir is in the form of an open-ended cylindrical body the openings of which are closed by pierceable rubber stoppers and the carrier material in the reservoir is enclosed between filters located at the top and bottom of the carrier material in the reservoir.