Radioactive cesium—specifically, cesium-137—is one of the waste products of nuclear power. It’s also one of the most dangerous substances in a nuclear disaster like Chernobyl or Fukushima.
One reason why is that the type of radiation it emits is particularly damaging to our bodies. Another is that cesium-137 dissolves in water. That means it can spread quickly through the environment and get into the plants, animal and water we consume.
Until now, scientists and disaster experts thought cesium-137 fallout from the Fukushima reactor meltdown was in this soluble form. That guided their cleanup efforts, like removing and washing topsoil, and helped them map where radiation might spread...
http://www.forbes.com/sites/samlemonick/2016/06/30/scientists-find-new-kind-of-fukushima-fallout/
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