The Russian scientists and firefighters who fought the Chernobyl fire reported a “metallic taste” in their mouth. That taste was from radioactive iodine. (It is well known that all iodine has a metallic taste.)
For example, Colonel Grebeniouk – who led the Russian troops in charge of controlling the situation – said:
There was a metallic taste in our mouths, an acidity. They say radiation has no taste. It was only later we realized it was the taste of radioactive iodine.
There is substantial evidence of ongoing nuclear chain reactions. Another piece of evidence – as pointed out by nuclear expert Arnie Gundersen – is that there are widespread anecdotal reports of people in Japan and the West Coast of the United States reporting a metallic taste in their mouths:
Hot Particles From Japan to Seattle Virtually Undetectable when Inhaled or Swallowed from Fairewinds Associates on Vimeo.
Note:It is possible that even if people are tasting iodine from Fukushima, it is no longer very radioactive. Specifically, radioactive iodine has a half-life of 8 days, and even non-radioactive iodine has a metallic taste. It is at least hypothetically possible that radioactive iodine blown over from japan got caught up in a high weather pattern long enough that it lost most of its radioactivity before being deposited to ground level. Further study is needed.