Organic substanc4e as a collector of recoil atoms ~234Th(~234U) in black shales

摘要

The content and isotopic composition of uranium extracted under various leaching and extraction conditions form the dyctionemic shale from Estonian deposits are determined by alpha-spectrometry. The interaction of uranium with organic matter (OM) was confirmed by a correlation between the specific radioactivity of uranium and contents of OM in the fractions obtained by electrostatic separation of the ground shale powder. Correlation between the results of two different analytical schemes is shown. The thickness of uranium phase layer deposited on organic matter in two parts of the seam is compared.