http://dspace.nbuv.gov.ua:80/handle/123456789/114724 2026-04-20T22:42:00Z 2026-04-20T22:42:00Z Konchits, A.A. Shanina, B.D. Valakh, M.Ya. Yanchuk, I.B. Yukhymchuk, V.O. Yefanov, A.V. Krasnovyd, S.V. Skoryk, M.A. http://dspace.nbuv.gov.ua:80/handle/123456789/120499 2017-06-13T00:03:31Z 2014-01-01T00:00:00Z

Spectroscopical study of natural nanostructured carbonaceous material shungite Konchits, A.A.; Shanina, B.D.; Valakh, M.Ya.; Yanchuk, I.B.; Yukhymchuk, V.O.; Yefanov, A.V.; Krasnovyd, S.V.; Skoryk, M.A. The correlation between morphology, local structure and magnetic properties of the different origin shungite material with nanocarbon content 25-40 wt. % was studied by SEM, EPR, and Raman scattering methods. It was established that structure of the shungite samples is formed by micron size agglomerations of carbon and silicon dioxide clusters with impregnations of pyrite (FeS₂), iron oxide and aluminium oxide particles. It was found from the Raman data that nanocarbon fraction is formed from sp²-hybridized well ordered carbon clusters, size of which increases from 9 nm up to 12 nm after annealing of the samples. It was found for the first time that origin of L3 and L4 EPR lines is due to oxy-deficiency centers in the silicon dioxide clusters.

2014-01-01T00:00:00Z Grigoryev, A.N. Sakun, A.V. Marushchenko, V.V. Bilyk, Z.V. Litvinov, Yu.V. Chernyavsky, O.Yu. Voronkin, E. http://dspace.nbuv.gov.ua:80/handle/123456789/120474 2017-06-13T00:04:21Z 2014-01-01T00:00:00Z

Alpha-, beta-, gamma-radiometric measurements using semiconductor detectors Grigoryev, A.N.; Sakun, A.V.; Marushchenko, V.V.; Bilyk, Z.V.; Litvinov, Yu.V.; Chernyavsky, O.Yu.; Voronkin, E. Referring to shortcomings of modern radiation detection and monitoring devices, an operable prototype of the device for determination of the gamma radiation exposure dose rate within the range from 10 μ R/h to 1000 R/h, with the energy γ -radiation sensitivity range from 50 keV to 3 MeV, has been offered. The prototype is able to register the α-radiation and β-radiation flux density. The device operates using two detection units and a two-channel counting unit. Registration of the exposure dose rate is provided by using CdTe detector, and registration of the α-radiation and β-radiation flux density is provided by using Si detector.

2014-01-01T00:00:00Z Ryzhikov, V.D. Grinyov, B.V. Onyshchenko, G.M. Piven, L.A. Naydenov, S.V. Lysetska, O.K. http://dspace.nbuv.gov.ua:80/handle/123456789/120471 2017-06-13T00:04:39Z 2014-01-01T00:00:00Z

The highly efficient gamma-neutron detector for control of fissionable radioactive materials Ryzhikov, V.D.; Grinyov, B.V.; Onyshchenko, G.M.; Piven, L.A.; Naydenov, S.V.; Lysetska, O.K. Comparative measurements and analysis of detection efficiency of fast and thermal neutrons from ²³⁹Pu-Be source by heavy oxide scintillators (Z≥50) confirmed high detection efficiency (∼ 40-50 %). The most probable mechanism determining the fast neutron detection efficiency is the reaction of inelastic scattering (n, n ′ γ ) as the main mechanism of interaction of neutrons with nuclei of oxide scintillators. The fast neutron detection efficiency was determined by the method of internal counting of gamma-quanta emerging in the scintillator under (n, n ′ γ ) reaction. It has been shown that the use of heavy oxide scintillators (which are also efficient gamma-detectors) in inspection systems can allow detection of fissionable radioactive materials.

2014-01-01T00:00:00Z Lytvynov, L.A. http://dspace.nbuv.gov.ua:80/handle/123456789/120469 2017-06-13T00:04:43Z 2014-01-01T00:00:00Z

Peculiarity of sapphire application in medicine Lytvynov, L.A. Considered are the properties of sapphire which make it expedient for application in relatively new branches of medicine such as microsurgery, implantology, medical instrument making. Peculiarities of the use of sapphire and its advantages over the analogues are shown.

2014-01-01T00:00:00Z