[en] Strontium-90, radiocesium, and other radionuclides were determined in samples from all over the country of air, precipitation, stream water, lake water, sea water, soil, sediments, dried milk, fresh milk, met, fish cheese, eggs, grain, bread, potatoes, vegetables, fruit, grass, lichen, sea plants, total diet, and humans. Estimates are given of the mean contents of radiostrontium and radiocesium in the human diet in Denmark during 1992 and 1993. Tritium was determined in precipitation, fresh water, and seawater. The γ-background was measured regularly by TLD's and a NaI detector. Tc-99 determinations were carried out on various marine samples, first of all seawater. (au) (102 tabs., 63 ills., 14 refs.)