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Information × Registration Number 0224U033236, (0121U108100) , R & D reports Title Studying and optimization of parameters of nuclear-physical facilities using mathematical modeling methods popup.stage_title Дослідження методами математичного моделювання можливості застосування радіографії для неруйнівного контролю твердопаливних прискорювачів з вичерпаним термін зберігання. Математичне моделювання фотоядерного виробництва ізотопів альфа-емітерів для ядерної медицини. Ідентифікація радіонуклідів за спектрами їх випромінювання за допомогою методів машинного навчання. Дослідження тонкої структури спектральної лінії випромінювання каналюючих релятивістських електронів в кристалі. Head Khazhmuradov Manap A., д.т.н. Registration Date 23-12-2024 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description1 The aim of the work is to study the processes that occur during passing of elementary particles through matter, and the development and optimization of devices where such processes are used. Problems of determining the elemental composition of various objects, including radioactive ones will be considered. The proposed work will also consider the following promising areas of research, such as neutron radiography, the use of neutron beams for medical purposes, based on which new techniques and technologies for various scientific and applied tasks may be developed. The development of new materials for protection against ionizing radiation, which should replace lead-based shielding materials will be studied and the possibility of radionuclides identification on the spectra of their radiation will be investigated. The aim of the work is also to study the interaction of relativistic charged particles with crystals. popup.description2  A model of the radiographic complex RGFK based on the small-sized pulsed betatron IB-7.5 has been developed. The possibility of determining the charge monolithicity, namely: detecting internal defects and their depth, has been shown. A two-stage installation with a tungsten converter irradiated by an electron beam from an accelerator, and a single-stage installation in which bremsstrahlung photons are formed in the target directly from the incident electron beam, have been considered. The spatial distribution of the specific activity and specific power of 225Ra for a single-stage and two-stage installation and a solid target for electron beam energies of 15, 20, 30 and 40 MeV has been obtained. Models for the identification of radionuclides by gamma radiation using machine learning methods have been considered. The best accuracy results are obtained for models based on the support vector method. The lowest accuracy is achieved by models of the naive Bayesian classifier and, thus, despite good accuracy and completeness, they are not suitable for solving the problem of determining the isotopic composition. Amendments to the modern theoretical model of radiation of channeling relativistic electrons (positrons) have been developed. Product Description popup.authors popup.nrat_date 2024-12-23 Close