Water chemistry and radon concentrations of thermal springs in Bastak area, south of Persia

Physicochemical factors, major and some minor ions and ²²²Rn concentration was measured in Todruyeh, Fotuyeh and Sanguyeh thermal balneutherapy springs in Bastak, south of Iran. Water type of these springs is Na-Cl and water-mixing phenomena seem possible in them. The average of U concentration in Fatuyeh's, Sanguyeh's and Todruyeh's water are 2.2, 1.1, 0.306 ppb, respectively, and the concentration of heavy metals such as Ag, Cd, Co, Cr, Cu, Hg, Ni, Pb, Se, Zn varies from 1 to 10 ppb. The concentration of ²²²Rn in the water of Fotuyeh, Sanguyeh and Todruyeh Springs includes 125-253, 53-104, and 7.4-134.7 kBq/m³, respectively. Values of mean annual effective doses for inhalation from these waters are below the reference level recommended by WHO. (author)