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Information × Registration Number 0224U033415, (0124U001974) , R & D reports Title Dosimetry of mixed nuclear radiation for the problems of radiation therapy popup.stage_title Експериментальне дослідження дозиметрії пучків високоенергетичних (е-, n-,γ-, γ-n ) ядерних частинок на базі мікротрона М-30 Head Roman Viktoriia I., Кандидат фізико-математичних наук Registration Date 27-12-2024 Organization Institute of Electronic Physics of the National Academy of Sciences of Ukraine popup.description1 The work aims to conduct cycles of irradiation of dosimetric materials based on the M-30 microtron, develop dosimetry methods of high-energy nuclear radiation from medical accelerators, and make recommendations for ensuring the radiation safety of patients and staff popup.description2 Report on the scientific project: 140 pages, 28 figures, 6 tables, 159 sources. A systematic study of the effect of nuclear irradiation on the optical properties of the magnesium-aluminum target (MASH), obtained in a cycle of experiments on the M-30 microtron, was conducted. The possibility of identifying and controlling the defect state of spinel crystals by optical methods is shown, as well as establishing the nature of radiation defect formation under the action of intense beams of high-energy electrons. It is shown that the phosphorescence characteristics make it possible to control the state of the structure of the local spinel energy levels in the band gap of the crystal, which provide information about its defectivity and radiation resistance. It was established that for MAS there is a stronger dependence of photodarkening on the radiation dose. For spinel crystals, the role of structural vacancies caused by Mg2+ and Al3+ cations, which are hole traps – V-centers, and electron traps associated with oxygen vacancies in tetra- and octa-F positions during radiation modification of their optical characteristics has been established. The peculiarities of the formation of color centers in unalloyed LiF crystals in the fields of high-energy 18 MeV radiation of the M-30 microtron were investigated. It is shown that in samples of unalloyed LiF, the formation of both simple F- and complex M-centers of color, and the latter are formed only when sufficient concentrations of F-centers are reached by their agglomeration. The study of the optical characteristics of irradiated unalloyed LiF confirms the transformation of simple coloring centers into complex complexes of the M-center type. It is shown that the concentrations of F- and M- color centers increase with an increase in the radiation dose. The obtained results can be useful for the formulation of new dosimetric technologies using beams of mixed nuclear radiation, as well as for the problems of radiation therapy. Product Description popup.authors Oleinikov Yevhen V. Papp Oleksandr V. Pylypchynets Ihor V. popup.nrat_date 2024-12-27 Close