Abstract
This paper deals with natural radioactivity of Palaeozoic sedimentary rocks in the map sheets 25-11 Hlubočky and 25-12 Hranice. All studied rocks belong to the Moravo-Silesian Palaeozoic, namely to three flysch formations (Horní Benešov, Moravice and Hradec-Kyjovice fms.) and two carbonate formations (Macocha and Líšeň fms.). Contents of potassium, uranium and thorium were measured using a laboratory gamma–ray spectrometer in 1 337 rock samples, values of mass activity of 226Ra equivalent (am) were calculated. The data are tabled and discussed. The average am of analysed flysch sediments is 160 Bq.kg-1. This value is very close to the value of am calculated for the average continental crust. Natural radioactivity of flysch sedimentary rocks grows from psefites (conglomerates) through psammites (graywackes dominate) to the group of aleurites and pelites (siltstones, silty shales, clay shales). Natural radioactivity of the studied carbonate rocks is very low. In dark biodetritic limestones of the Líšeň Fm. there were found slightly increased uranium contents (typically up to 6 ppm). Uranium in the rock is probably bound to graphitic matter.
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