#Iodine has 37 known isotopes, and all but one are radioactive. Most of them have disintegration periods of less than 60 days and #Iodine131 is the most present in media because it is a fission product and is one of the radiological pollutants in cases of nuclear accidents due to its biological importance
#ThyroidGland needs 80 micrograms daily to produce hormones but in the case of treated water from #Fukushima
there should be hardly any radioactive #Iodine versus #Strontium or #TritiatedWater