[[Tjernobylulykken]] sendte store mængder radioaktive stoffer ud i atmosfæren og det skabte radioaktivt nedfald i større dele af Europa.
<ref>[http://news.bbc.co.uk/2/shared/spl/hi/guides/456900/456957/html/nn3page1.stm BBC News: Chernobyl: Environment] Citat: "...The disaster released at least 100 times more radiation than the atom bombs dropped on Nagasaki and Hiroshima...Contamination with caesium and strontium is of particular concern, as it will be present in the soil for many years...But wind direction and uneven rainfall left some areas more contaminated than their immediate neighbours..."</ref>
Samfund Fysik Kemi Teknologi