National Repository of Grey Literature 6 records found  Search took 0.01 seconds. 
Spectral flux of the p-Li-7(C) Q-M neutron source measured by proton recoil telescope
Novák, Jan ; Bém, Pavel ; Fischer, U. ; Götz, Miloslav ; Honusek, Milan ; Simakov, S. P. ; Šimečková, Eva ; Štefánik, Milan
The cyclotron-based fast neutron source at NPI produces mono-energetic neutron fields up to 35 MeV neutron energy using the p + 7Li(carbon backing) reactions. To be applied for activation cross-section measurements, not only the intensity of neutron peak, but also the contribution of low-energy continuum in the spectra must be well determined. Simulations of the spectral flux from present source at a position of irradiated samples were performed using CYRIC TOF-data validated in the present work against LA150h by calculations with the transport Monte Carlo code MCNPX.
The activation of W and Zr by deuterons at energies up to 20 MeV
Šimečková, Eva ; Štefánik, Milan ; Bém, Pavel ; Mrázek, Jaromír ; Novák, Jan
The proton and deuteron induced reactions are of a great interest for the assessment of induced radioactivity of accelerator components, target and beam stoppers. In order to investigate the important nuclides, we have carried up the irradiation experiments with the variable-energy cyclotron U-120 M of the NPI CAS ež. The production cross sections of the nuclides 179,181,182m,182,183,184m,184,186Re and 187W from reaction on natural W were investigated by deuteron beams of 20 MeV energy. A part of preliminary results of deuteron activation of natural Zr is also shown. The stacked-foil technique was utilized. The comparison of present results to data of other authors and to predictions of evaluated data libraries is discussed.
Proton and deuteron activation measurements at the NPI and future plans in SPIRAL2/NFS
Šimečková, Eva ; Bém, Pavel ; Mrázek, Jaromír ; Štefánik, Milan ; Běhal, Radomír ; Glagolev, Vadim
The proton- and deuteron-induced reactions are of a great interest for the assessment of induced radioactivity of accelerator components, target and beam stoppers as well as isotope production for medicine. In the present work, the deuteron-induced reaction cross sections on zinc were investigated by stacked-foil activation technique with deuteron beam of 20 MeV energy from the cyclotron U-120M of NPI CAS ež. Also the proton activation cross section measurement of iron is presented. The comparison of present results to data of other authors and to predictions of evaluated data libraries is discussed. The investigation shall continue for higher proton and deuteron energy interval 20-35 MeV at SPIRAL2/NFS facility using a charged particle irradiation chamber with pneumatic transport system to measure isotopes and isomers with half-lives in minutes-regions.
Ionizing radiation behavior and shielding
Konček, Róbert ; Štefánik, Milan (referee) ; Katovský, Karel (advisor)
Ionizing radiation is radiation with particle energies greater than the energy needed to remove an outermost electron from an atom. Exposure to ionizing radiation causes damage to living tissue, and can result in detrimental mutations. Thus, ionizing radiation shielding is discipline of great practical importance. This thesis is concerned with its basic principles and methods. Firstly, it gives thorough account of four major classes of ionizing radiation - alpha and beta particles, gamma rays, and neutron radiation - and their peculiarities with respect to shielding. The next part contains description of mathematical model developed to assess and simulate interactions of radiation with matter. Finally, assignment for a laboratory exercise is presented.
Nanotechnology utilization in nuclear industry and research
Skalička, Jiří ; Štefánik, Milan (referee) ; Katovský, Karel (advisor)
This thesis introduces reader to current knowledge of nanomaterials and their usage. It summarises production methods and usage of different materials in nuclear power plants, nuclear research and nuclear medicine. Theoretical part of this thesis is dedicated to possible usage of carbon nanotubes for neutron beam collimation and guides. In experimental part different materials were tested in measuring box connected to horizontal radial channel of VR-1 nuclear reactor and their influence on neutron flux was measured. Tested samples were non-oriented carbon nanotubes, carbon nanofibers, alumina nanowires, oriented carbon nanotubes with several angles of rotation and these samples were compared with results of graphite.

See also: similar author names
1 Štefánik, M.
1 Štefánik, Martin
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