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	Uran-polymetallic mineralization of the Jánská vein, Příbram-Březové Hory, ČR: Radionuclide alpha spectrometric determination Jarka, Petr ; Goliáš, Viktor (advisor) ; Fejgl, Michal (referee) Detailed record
	Uran-polymetallic mineralization of the Jánská vein, Příbram-Březové Hory, ČR: Radionuclide alpha spectrometric determination Jarka, Petr ; Goliáš, Viktor (advisor) ; Fejgl, Michal (referee) Detailed record
	The dating of the minerals o uranium-polymetallic mineralization of the Jánská vein, Příbram-Březové Hory, ČR, using alpha-spectrometric determination of the radioactive disequilibrium of isotope pairs of uranium decay series (technical part);Radioactivity in nature and its utilization in the geological sciences (didactical part) Jarka, Petr ; Němec, Mojmír (referee) The thesis deals with distribution and determination of natural radionuclides occured in primary and secondary mineralization of Jánská vein, which represents the part of uranium - polymetallic deposit of Březové Hory, Příbram polymetallic district. Mineralization of the vein is very variable, especially that of secondary U, Pb and U-Pb phases presence. Moreover, some of the phases have the origin in present or recently passed times. The aim of the investigation was to determine the contents of radioisotopes in the primary and secondary mineralization with the help of non-destructive and destructive methods of alpha spectrometry. The dating of secondary mineral phases was provided on the basis of radioactive disequilibrium of 230 Th /234 U radionuclides. Non-destructive alpha spectrometry was selected for its simplicity as a method eligible for qualitative analyses of the enormous number of samples. During the quantification of the results of non- destructive alpha spectrometry, the activities, radioisotopic concentrations and isotopic ratios of 238 U/226 Ra and 210 Po/226 Ra were calculated. The method applied on the whole set of samples was verified by reference materials CRM 129-A (uranium oxide) and BL-5 (uranium ore). Uranium and uranium equivalent concentrations of its daughter products in... Detailed record

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