Sixty years old 137Cs from nuclear weapons fallout contributes significantly to the notorious contamination levels in wild boars in Central Europe that were previously believed to be dominated by Chornobyl.

The fission product cesium-137 (137Cs, half-life T1/2 = 30.08 y) is a prominent example of such contaminants as it is ubiquitously present in the environment. It originates from the fallout of atmospheric nuclear explosions from the mid-20th century (weapons-137Cs) and nuclear accidents, most prominently the Chornobyl and Fukushima nuclear accidents (reactor-137Cs)