The Jan 1, 2020 to May 31, 2020 TGR CPM INCREASE of 1,592,791,963 cpm over a period of 3624 hours = 439,512.1310706402 cpm per hour Nationwide. That’s just 151 days. That’s way too much Gamma Radiation for any of us. See the VT RadNet city to city detail chart for your particular city or area. […] Source: VT