Radon concentration in air and external gamma dose rate: is there a correlation? - Yoshimura, Elisabeth Mateus; Silva, Almy Anacleto Rodrigues da; Anjos, Roberto M. dos; Umisedo, Nancy Kuniko; Rizzotto, Marcos; Velasco, Hugo; Valladares, Diego L. (Journal of Radioanalytical and Nuclear Chemistry, 2016)