Perhaps worth noting that the amount of radiation being leaking from Fukushima are actually pretty small (0.3 terabecquerels per month) when compared to historical H-bomb tests (~100,000 TBq):

http://www.newscientist.com/article/dn24100-should-fukushima...

Edit: There was even one, relatively small, nuclear test about 500 miles from San Diego:

http://en.wikipedia.org/wiki/Operation_Wigwam