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  • Neutron induced autoradiography of some minerals from the Allchar mine : Presented at the 19th International Conference on Nuclear Tracks in Solids, Besançon, 31 August - 4 September, 1998
    Lazaru, A. ...
    The mineral lorandite from the Allchar mine (Kavadarci, Macedonia) will be used to estimate the average solar neutrino flux. Here, the amount of ▫$^{205}$▫Pb isotope induced by the ... ▫$^{205}$▫Tl(▫$v_e$▫, e)▫$^{205}$▫Pb reaction is measured and converted to neutrino flux. To determine the few ▫$^{205}$▫Pb atoms that are produced by solar neutrinos in the Tl ore it is necessary to know all the interfering reactions and/or impurities producing ▫$^{205}$▫Pb. The concentration and/or spatial distribution of some impurities such as U in lorandite should be known as accurately as possible. In the present work uranium and boron concentrations in some minerals from the Allchar mine (lorandite, relgar, stibnite,orpiment and dolomite) were measured by neutron induced autoradiography. The tracks of ▫$^{10}$▫B(n, ▫$\alpha$▫) and ▫$^{235}$▫U(n, f) reaction products were recorded by CR-39 and phosphate glass (PSK-50) etched track detectors, respectively. Results showed that uranium is nonuniformly distributed in some of the minerals (orpiment, realgar and lorandite). Average uranium concentration levels varied from 0.01 to 1 ▫$\mu$▫g ▫$g^{-1}$▫ . The highest boron concentration (about 6.7 ▫$\mu$▫g g▫${-1}$▫ was found in stibnite while its concentration in other minerals was below the detection limit (about 1 ▫$\mu$▫g ▫$g^{-1}$▫) of the technique.
    Vir: Radiation measurements. - ISSN 1350-4487 (31, 1999, str. 677-682)
    Vrsta gradiva - prispevek na konferenci
    Leto - 1999
    Jezik - angleški
    COBISS.SI-ID - 4745238

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