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The present invention relates to a process for the production of no-carrier added 99 Mo by neutron activation of 98 Mo thereby reaching specific radioactivity which allow the use of such produced 99 Mo as an option for the 99 Mo produced by the fission of 235 U. This has been achieved by taking advantage of the recoil of the 99 Mo nuclei upon the capture of neutrons by the 98 Mo containing compound. These recoiled nuclei are no longer chemically bound to the 98 Mo containing compound allowing further specific separation. Preferred 98 Mo containing compounds are molybdenum(0)hexacarbonyl[(Mo(CO) 6 ] and molybdenum(VI)dioxo-dioxinate [C 4 H 3 (O)-NC 5 H 3 )] 2 -MoO 2 .