http://pissinontheroses.blogspot.com/2012/06/airborne-300x-radiation-alert-in.htm
(c)2012 http://www.POTRBLOG.com, with some "fair use" excerpts.

From midnight of June 6th 2012 to 4am June 7th 2012, there was a four hour alert sent out on private radiation monitoring networks concerning a private radiation monitor in South Bend, Indiana which was detecting airborne radioactivity at 300-400 times above background levels.

In this video we step though our rapid methodology for judging the veracity of these kinds of detections. As a bonus, at the end of the video we give a sneak preview of the results from our professional laboratory testing of Pre and Post Fukushima Ground beef.