believe it or not I went to a scrap yard in Longveiw Texas the yard guy came out with a hand held Geiger counter turned it on and it started beeping he adjusted on it for a while it kept on beeping he gave it to another employee who kept on adjusting it and kept checking the load it kept beeping he took the counter back to the office and came back out told us to go unload the scrap we collected our money and left they are no longer in business TRUE STORY