Abstract
The paper deals with natural radioactivity of crystalline rocks, Palaeozoic sedimentary rocks and selected Cenozoic sediments on the map sheet 24-22 Olomouc. Studied rocks belong to the following geological units: the Brunovistulicum (Proterozoic granitoids and dioritoids, often mylonitized), the Moravo-Silesian Palaeozoic (mainly carbonate rocks of the Macocha and Líšeň Fms. and flysch sediments of the Andělská Hora, Protivanov, Horní Benešov, Rozstání, Moravice and Myslejovice Fms.), the Carpathian Foredeep (Miocene marine sands and clays) and the Upper Morava Basin (Pliocene-Pleistocene lacustrine and fluvial sediments, and loesses). Contents of potassium, uranium and thorium were measured using a laboratory gamma–ray spectrometer in 612 rock samples. Data are tabled and discussed. From calculated values of mass activity of 226Ra equivalent (am) it is evident that natural radioactivity of the studied rocks is predominantly low. Slightly increased am values were found in silty shales, clay shales and siltstones of the Rozstání Fm. (189 Bq.kg-1 on average, 308 Bq.kg-1 in the sample with the highest natural radioactivity).
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