This radiation test was done at about noon CST 2/8/2012 -- location : Grant Park / Jackson St. and Columbus / Downtown Chicago -- 41°52'37.37"N , 87°37'17.59"W
The results have come back @ several locations (ground level) from Byron Nuclear power plant all the way south east to the city of Chicago --- all in the 40-50CPM range. (alert level is 100CPM)
This test is no exception to the others -- 47CPM is the high count. Roughly HALF the alert level just in background radiation.