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The key industrial method for producing  99 Mo is production of the radionuclide as one of the  235 U fission fragments.  235 U is irradiated with neutrons in a nuclear reactor (both heterogeneous and homogeneous nuclear reactors can be used) and then processed in radiochemical laboratories, where  99 Mo is chemically extracted from fission products. Both highly enriched uranium ( HEU ) and low enriched uranium ( LEU ) can be used to produce  99 Mo by the fragmentation method. To date, almost all world producers, with the exception of Russia, are either in the final stages of transferring production from highly enriched uranium to low enriched uranium, or are already producing  99 Mo using  LEU . This is due to the problems of non-proliferation of nuclear materials and the prevention of the likelihood of terrorist threats. A number of experimental studies have been carried out on the basis of the VVR-ts research reactor. Experimental studies included the study of the effect of  LEU  targets on the reactivity reserve of the VVR-ts reactor, irradiation of these targets in experimental channels and separation of  99 Mo from them. The paper presents the results of producing and separating  99 Mo from targets with  LEU  material. It is shown that it is necessary to improve the processing technology to increase the production of fragmented  99 Mo from  LEU .

﻿Experience in the production of 99 Mo from low enriched uranium at the VVR-ts research nuclear facility

Experience in the production of 99 Mo from low enriched uranium at the VVR-ts research nuclear facility