'Any person living in the contiguous United States since 1951 has been exposed to radioactive fallout, and all organs and tissues of the body have received some radiation exposure.'
In this case, it would be 1950's if we were talking about the fallout of 1950, but we're talking about the fallout of the entire '50s -- thus, the 1950s.
I am halfway through a book on the British atomic bomb tests in Australia during the sixth decade of the last century, and the bullshit that was thrown around by the 'experts' about the effects of fallout would make you cringe, then laugh out loud.
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