ClarG wrote:What about the radioactive ocean water that gets into the rain or snow?
The primary radioactive contaminant of concern is Cesium-137. Once it gets into the ocean water, it will form an ion, as part of a salt just like Sodium or Potassium (Cesium is the next heaviest alkali metal on the periodic table). When water evaporates from the ocean, to form clouds, then rain and snow, the dissolved metals do not evaporate with it (when you evaporate salt water, the salt stays behind). Therefore the radioactive contamination will stay in the ocean water (where it is very, very, very diluted). Multiple nuclear reactors have been dumped into the ocean, and you get only nanoscopic levels of trace contamination from them in ocean food.