The authors analysed the contamination of food products by Cs-134, Cs-137, Sr-90, and Ra-226 caused by the Chernobyl disaster during the period 1985-2005. The radiation process concerned primarily: raw milk, meat of slaughter animals, fish, eggs, plants and mushrooms, cultivated vegeta-bles and fruit produced in Poland. The results of the analysis showed that the concentration of radionuclides, which caused the con-tamination of the natural environment in 1986, is subject to changes consisting in the decrease on scale. During the period 1985-2005, the radiation in the natural environment was approximately 1.5% of the dose per individual, which is not harmful for the human body. The hazardous effect of radionu-clides depends on duration of exposure, distance, and the portal of entry into the living body. In recent years, the highest concentration of radionuclides has been observed in the meat of sea fish, egg mass of breeding hens, and the parenchyma of forest mushrooms.