Preface: I'm not a conspiracy nut. Nor do I have a tinfoil hat... Be skeptical, nothing really has been proven.
Someone is claiming there is a giant radiation coverup. Some interesting stuff in the comments about the whole thing.
http://www.reddit.com/r/politics/comments/uqlq9/reddit_i_think_there_is_a_giant_nuclear_coverup/ (http://www.reddit.com/r/politics/comments/uqlq9/reddit_i_think_there_is_a_giant_nuclear_coverup/)
http://www.reddit.com/r/politics/comments/urm6c/updates_past_23_for_the_nuclear_thread/ (http://www.reddit.com/r/politics/comments/urm6c/updates_past_23_for_the_nuclear_thread/)
Relevance here?
It was more than likely caused by a HAARP test.