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Attempts have been made to use Szilard Chalmers reaction to prepare   99 Mo and   90 Y in high specific activity. Experiments were carried out using irradiation of freshly prepared oxinate complexes of molybdenum and yttrium in the HOR reactor of Reactor Institute at TU Delft. The irradiated target was dissolved in dichloromethane and the radionuclides were separated by solvent extraction into aqueous phase. Detailed investigations on the effect of pH of aqueous solution, irradiation time and target amount was also carried out to optimize the enrichment factor and yield. The highest enrichment factor for   99 Mo was found to be around 200 with a yield close to 30%. In the case of   90 Y, solvent extraction method did not yield high enrichment factors. Slightly higher enrichment factors were achieved with ion exchange method. Studies were also carried out with yttrium oxide nano-powder. Speciation study of   99 Mo in the separated aqueous fraction showed it to be present as   99 MoO 4  2−  ion. The results appear to be quite promising for large scale production of   99 Mo for medical applications.

Studies on production of high specific activity 99 Mo and 90 Y by Szilard Chalmers reaction