Readings from my geiger counter monitoring background radiation.SF Bay Area. Blog about the setup http://botsmaker.blogspot.com/2011/03/ustreaming-geiger-counter.html Sometimes a high peak will show. I have a long serial line from the equipment to the PC and sometimes an error will show. I currently have a possible solution and will apply it when I can. The average peak is about 25 CPM at this location.