Extended Survey of Indoor and Outdoor Terrestrial Gamma Radiation in Greek Urban Areas by In situ Gamma Spectrometry with Portable Ge Detector

The results obtained from more than 1000 indoor and outdoor in situ gamma spectrometry measurements in 41 towns (from all geographic subdivisions) of the Greek mainland (not islands) are presented. From the in situ gamma spectra the absorbed dose rate in air due to uranium series, thorium series, 40K and 137Cs are derived and discussed.