http://www.bbc.co.uk/news/uk-england-cumbria-25975785 They have/had "above normal levels" at a perimeter detector. As far as I know this would detect airborne radiation. And presumably at far lower levels than the source. "A spokesman stressed there was no risk to the public or workforce." Really? So they tell all non essential people to stay home on a whim? That is not a reaction to no risk. It is a reaction to some risk. Am I adding two twos and getting five to think that there is a significant leak somewhere within the plant. (By significant I mean a release that is a result of a failure of three safety systems - defense in depth usually means three layers of safety systems). Perhaps I am just bitching about a spokesman who thinks we are stupid and doesn't mind stretching the truth.