"The isotopes in bananas are also much worse because you ingest them: radioactive isotopes on the skin can be showered off; ones in your intestines ... not so m

"The isotopes in bananas are also much worse because you ingest them: radioactive isotopes on the skin can be showered off; ones in your intestines ... not so much..." Well you can ingest isotopes from nuclear power plants, too. For example the cesium from Chernobyl "accumulates" in mushrooms (I hope you can figure out what Imean by accumulate, don't know a better word for it), even today. In Germany they still shoot wild pigs and mark them unfit for human consumption because because they eat those mushrooms and hence become radioactive. Anyway, nobody has claimed that the isotopes from Fukushima are endangering SF - yet. I apologize for misreading about water supply vs rain. "one of the best aspects of an engineering education is the notion of "tolerances"." People just seem to have different comfort zones. And there is always Murphy's law, as Fukushima demonstrated again (earthquake+Tsunami at the same time).