Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 2 4 1973 12 15 206 213 B.Khademi MA. Hanjani 2015 10 03 The existence of Ra 226 is proved and measured by radiom emanation-method in waters and food products of North , North West and North – East of Iran. A total of 126 water, 249 food and 22 air samples have been examined. The concertration of Ra 226 in waters found to be 0.01 to 1.104 Pci/1 and in food products from 0.01 to Pci/gr. Ash.The amount found in due ranges from 0.003 to 0.227 Pci/m 3.It is concluded that the presence of higher than normal activity in some parts of Northern Iran is due to radiationanomalies in subsurface strata, where these mineral waters pass. Further investigattions are recommended. https://ijph.tums.ac.ir/index.php/ijph/article/view/1474 https://ijph.tums.ac.ir/index.php/ijph/article/download/1474/1455