“…Considering radon data for spas in Slovenia (Kobal et al, 1979), Hungary (Szerbin, 1996), Germany (Trautmannsheimer et al, 2003), Greece (Vogiannis et al, Radioactivity 83 (2005) 191e198 in press), Poland (Przylibski, 2000), Spain (Soto et al, 1995), Venezuela (Horvath et al, 2000), USA (Nazaroff, 1988) and Taiwan (Sabol et al, 1995), where radon concentrations in thermal water have been from 0.2 to 600 kBq/m 3 , the radon levels in Croatian spas have been rather low.…”