Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 7 4 1978 12 15 207 212 B.Khademi C.Levain 2015 10 03 The existence of a high natural radiation area in the northern part of Iran (Ramsar) is proved. Ra 226 in soil is measured. The results are: minimum 23.5 pCi/g and maximum 999 pCi/g soil. Environmental radioactivity is from 0.1 to 5 mr/h. https://ijph.tums.ac.ir/index.php/ijph/article/view/2679 https://ijph.tums.ac.ir/index.php/ijph/article/download/2679/2659