Background Radiation Data - Radioactivity Monitoring Online
European Network

The data for this graph is obtained using a geiger counter connected to a PC. The counter is manufactured by Black Cat Systems, model GM45.
Certified accuracy:
The GM-45 probe was recalibrated July 11, 2016 according to the GAMMA-SCOUT®. This is tested in an authorized institute by the state. Each unit is supplied with a certificate stating its serial number.
Radiation Monitor commissioned 1 Nov, 2011. For educational and experimental processes only.