International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The paper describes a technology for obtaining Mo-98 from waste from the production of industrial Tс-99m generators, followed by regeneration, purification and obtaining molybdenum trioxide enriched with molybdenum-98 for the purpose of reuse for the production of Tс-99m generators. Regeneration of molybdenum trioxide with Mo-98 from spent Tc-99m generators was carried out by the elution method in dynamic mode: aluminum oxide from industrial spent Tc-99m generators was loaded into the column and a solution of sulfuric acid (1 mol/l) was passed through the column at a rate of 2.0-2.5 ml/min.The purification of regenerated molybdenum trioxide with Mo-98 from possible radionuclide impurities and residues of sulfuric acid anions was carried out on an ion-exchange resin – anionite quaternary phosphonium base in Cl-form. Desorption of molybdenum from the solid phase of the sorbent was carried out with a solution of ammonium nitrate (1 mol/l) containing 0.01-0.05% hydrogen peroxide and 8-10% aqueous ammonia solution with an elution rate of 1 ml/min, while molybdenum was washed out with a yield of up to 80%.Using the emission spectral analysis method, it was determined that the mass fraction of metal impurities in the regenerated molybdenum trioxide enriched with Mo-98 complies with the requirements of Technical Specifications 95 641-79 “Molybdenum trioxide enriched with molybdenum-98″. During the neutron activation analysis of regenerated molybdenum trioxide enriched with Mo-98, only gamma spectra of the parent radionuclide Mo-99 with gamma lines of 180 keV, 740 keV and 780 keV and only the gamma spectrum of the daughter radionuclide Tc-99m with the gamma line of 140 keV were obtained, which proves the absence of any radionuclide impurities in the regenerated molybdenum trioxide.The developed technology for obtaining Mo-98 from spent Tc-99m generators, its subsequent regeneration and purification showed that regenerated and purified molybdenum trioxide enriched with molybdenum-98 can be used as a feedstock for the production of industrial Tc-99m generators.

The type of supply voltage of the coil to achieve maximum induction and uniformity of the magnetic field in the magnetic chamber, where the processed material is determinate. The experimentally obtained dependence curves B=f(U) can be used to optimize the regime parameters when processing various agricultural materials in a magnetic field.