Contaminants fingerprinting in environmental matrices of Radon concentration in groundwater: A baseline study in Alappuzha (Kerala) and the associated health effects - Selvam Sekar; Akhila V. Nath; Muthukumar Perumal; Priyadarsi D. Roy; Amin Ullah; Muralitharan Jothimani (PLoS ONE, 2026)