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Welcome to RadiationNetwork.com, home of the National Radiation Map, depicting environmental radiation levels across the USA, updated in real time every minute. This is the first web site where the average citizen (or anyone in the world) can see what radiation levels are anywhere in the USA at any time.
The numbers represent radiation Counts per Minute, abbreviated CPM, and under normal conditions, quantify the level of background radiation, i.e. environmental radiation from outer space as well as from the earth's crust and air. Depending on your location, your elevation or altitude, and your model of Geiger counter,this background radiation level might average anywhere from 5 to 60 CPM, and while background radiation levels are random, it would be unusual for those levels to exceed 100 CPM. Thus, the "Alert Level" for the National Radiation Map is 100 CPM, so if you see any Monitoring Stations with CPM value above 100, further indicated by an Alert symbol over those stations, it probably means that some radioactive source above and beyond background radiation is responsible.
Disclaimer: Mineralab, LLC, the operator of this web site, can not independently verify that the Radiation Levels, or any Radiation Alerts, that are displayed on this Radiation Map are correct and valid. Among other possibilities, Geiger counter malfunctions or proximity of the counters to certain medical procedures or to radioactive items can cause high readings at a Monitoring Station.