The possibility of photonuclear production of 99Mo medical radioisotope using recoil nuclei of molybdenite nanoparticles from reaction 100Mo(γ,n)99Mo was investigated. The enrichment of radioactive isotopes is carried out by the effect of Szilard-Chalmers. Molybdenite nanoparticles were irradiated by bremsstrahlung with Emax = 39 MeV. The recoil nuclei of 99Mo are separated by electrolysis. The yield of 99Mo from the extractable phase amounted to ~3%. This technology will allow producing 0.8 GBq/g of 99mTc with high specific activity per day. Key words: linear electron accelerator, photonuclear production, electrolysis, specific activity, recoil nuclei, molybdenite nanoparticles.

The results of the application of various nuclear physics methods (characteristic X-ray radiation, gammaactivation analysis, and X-ray fluorescence analysis) to the study of the imbalance of certain elements in various biological samples (blood, hair, gastric mucus) in patients with superficial gastritis with increased and decreased secretory activity. The detection limit ranged from 10-4…10-7 mas.% of the mass. Particular attention was paid to sample preparation and the study of the analytical capabilities of the methods. It is shown that in this pathology there is an increased content of essential elements in the hair and a significant content of conditionally toxic and toxic elements in the blood and gastric mucus.

The granites of the Ukrainian crystalline shield and the Donetsk-Dnieper hollow of the Pre-Cambrian basement, discovered at a depth of 840…900 to 3420 m were irradiated on a KUT-1 linear electron accelerator with the following parameters: electron energy Е ≈ 7 MeV, average beam current I = 500 µA, temperature of the irradiated samples Т~ 40°С, absorbed dose Dabs = 107 Gy. Gamma-activation analysis was used to determine the content of elements in the samples. The samples were irradiated by bremsstrahlung from the linear accelerator electron NSC KIPT with energy 23 MeV and current 500 µA. The structure and phase composition of samples were investigation by infrared spectroscopy in the frequency 400…4000 cm-1. Crystal optical studies were carried out on polarizing microscope using immersion liquides. It is shown that high-energy electron irradiation of granites causes radiationstimulated transformations in the structure and phase homogeneity of mineral. The most pronounced changes in biotites after high-energy electron irradiation of granites are manifested in a change in the color of biotite, apparently due to oxide phases Fe2O3 and Fe3O4. Considering the state of granites under radiation conditions it can be used for the immobilization and disposal of radioactive waste.