The bars on the figure give the number of anomalies recorded on a blindfolded camera's CCD. Each bar corresponds to the number of anomalies per 1 minute. Anomalies are electron charges at the semiconductor-oxide interface of the CCD, which are created by gamma rays (or cosmic rays) and give white pixels (depicted in the upper panel of the image). For the latest measurement click the image. The history of measurements can be found here.
Project details:
This service is running on Rozolutions servers and gives the background radiation of Athens.Â
This service is based on RadioA project. A Samsung Galaxy Mini GT-S5570 is used as measuring device.
Check this Wikipedia article to find more information regarding radiation units. The Athens average is 0.20 - 0.60 uGy/h.
Offical radiation measurements from GAEC.