Reference levels for workplaces processing materials with enhanced levels of naturally occurring radionuclides : a guide to assist implementation of Title VII of the European Basic Safety Standards Directive (BSS) concerning natural radiation sources - Evropská komise. Environment Directorate-General (Luxembourg : Office for Official Publications of the European Communities, 1999)
Keywords: radioaktivita; radioaktivní odpad; studie; radioactivity; radioactive waste; studies