Investigation of radon concentrations in some reservoirs, spring and tap waters in A degrees stanbul, Turkey

The Rn-222 activity in water samples from reservoirs, springs and taps in the area of Istanbul, Turkey has been measured with an AlphaGUARD system. The measured concentrations ranged from 0.6 to 3 Bq L-1 for reservoirs, 1.6-14 Bq L-1 for springs and 0.8-1.4 Bq L-1 for taps. These values are compared with similar measurements elsewhere in Turkey and other countries. They lie within recommended safe limits published by WHO and UNSCEAR and, with the exception of three spring water samples, they lie within the more stringent limits set by the USEPA. The resulting annual effective doses due to water ingestion and inhalation are discussed