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In page Molybdenum:

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The most common isotopic molybdenum application involves molybdenum-99, which is a fission product. It is a parent radioisotope to the short-lived gamma-emitting daughter radioisotope technetium-99m, a nuclear isomer used in various imaging applications in medicine.[3] In 2008, the Delft University of Technology applied for a patent on the molybdenum-98-based production of molybdenum-99.[4]