U.S., Europe, Australia & South America Real Time Radiation Network Air Monitoring
= Nuclear Site Alert Level = 100 CPM
Data from Radiation Network
Readings not Equalized denotes the Monitoring Stations are broadcasting raw radiation counts from their Geiger counters, with out adjustment for different count rates existing between various Geiger counter designs. For instance, models built around a "Pancake" (see Map Legend) style of Geiger-Mueller tube typically have about a 3 times count rate over Standard tubed models, in that their readings in CPM should be expected to average about 3 times higher, anyway.
How the Radiation Map Works:
An ever expanding number of Radiation Monitoring Stations across the country (and world). In use are various models of Geiger Counters, they upload their Radiation Count data in real time to their computer using a Data Cable, and then to the Internet and to this web site, all is accomplished through GeigerGraph for Networks software. This is an automated system - there is no manual posting of data required.
How to Read the Map:
Referring to the Map Legend at the bottom left corner of the map, locate Monitoring Stations around the country that are contributing radiation data to this map as you read this, and watch the numbers on those monitoring stations update as frequently as every minute (your browser will automatically refresh). 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.
Notice the Time and Date Stamp at the bottom center of the Map. That is Arizona Time, from where we service the Network, and your indication of how recently the Radiation Levels have been updated to the Map.