Caesium

'Archaic nuclear reactor designs such as those used at Fukushima – built by American company General Electric – were chosen because they were good for making nuclear bombs. The U.S. secretly helped Japan develop its nuclear weapons program starting in the the 1980s. Therefore, the U.S. played a large role in Japan’s development of nuclear energy. (See this).

After the Fukushima disaster – in an effort to protect the American nuclear industry – the U.S. has joined Japan in raising “acceptable” radiation levels. U.S. Secretary of State Hillary Clinton also signed a pact with her counterpart in Japan agreeing that the U.S. will continue buying seafood from Japan, despite the fact that the FDA is refusing to test seafood for radiation in any meaningful fashion. So U.S. actions are helping to protect a pro-nuclear policy in Japan.'

Read more: Nuclear Radiation: Washington Forces the Re-Start of Japan’s Nuclear Reactors