The natural radiation environment VII : Seventh International Symposium on The Natural Radiation Environment (NRE-VII) Rhodes, Greece, 20-24 May 2002 - McLaughlin, J. P.; Σιμόπουλος, Σίμος Ε.; Steinhausler, F.; McLaughlin, J. P.; Σιμόπουλος, Σίμος Ε; Steinhaüsler, F. (Radioactivity in the environment,, 2005)