With courtesy of De Cort et al. (1998): "Atlas of Caesium Deposition on Europe after the Chernobyl Accident", EUR report nr. 16733, EC, Office for Official Publications of the European Communities, Luxembourg
Showers require as little as a third of the water! However, this is true as long as you keep them under five minutes long. So be quick and use a shower timer to keep track of time next time you hop in!
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