Geological and radiometric prospecting work was carried out to study the nature of the radioactivity of sedimentary deposits - dictyonemous sсhists. Outcrops of these rocks during geological mapping by previous researchers were noted at various points in the northwestern part of the Leningrad region. The results of research and processing of materials collected during field work in a compressed form and are presented by us in this article. A geological and economic assessment of schist as a possible type of new raw material for the production of radium and thorium oxide was carried out. The assessment of points with manifestations of radioactivity largely depends on the form of radium in the schist, and if some portion of it is in a dispersed state and not associated with uranium, the value of the raw material increases. significantly.
