Many Berkeley residents have been in touch with us today asking about the helicopters that have been flying overhead, across the city and also into Oakland. A call to Berkeley Police Department confirms that the choppers are out measuring baseline radiation levels.

The flyovers are part of research by two federal security agencies — the Department of Homeland Security and the National Nuclear Security Administration — to compare aerial and ground based mapping of radioactivity, according to a story in the Contra Costa Times.

Source: http://www.berkeleyside.com/2012/08/29/low-flying-helicopters-over-...

(nothing to do with Fukushima; that's why it's not mentioned ;)  move along people...nothing to see here)