Radon-thoron exhalation rates in mineral-enriched beach sand of the Chennai coast, India - M. John Samson; K. Manikanda Bharath; A. Vidyasakar; K. Ajith Kumar; V. Arun Bharathi; Satyanarayan Bramha; S. Chandrasekaran; Kannaiyan Neelavannan; V. Gopal; S. Ajith Kumar; N. Sivakumar (Environmental Geochemistry and Health, 2026)