[1] . Uzunov I et al:Health Phys 1981,41:807~813.
[2] . Danali S et al.: Health Phys 1986,50(4):509~513.
[3] . UNSCEAR Report 1982.
[4] . UNSCEAR Report 1986.
[5] . Travis CC et al:Nuclear Safety 1979,20(6):722.
[6] . Gragnani R et al:in Natural Radiation Environment (KG Uohra et al eds) 1982,p415~421, Wiley Eastern Lid,New Delhi.
[7] . McCurdy DE et al:Health Phys 1980,40(2):250~253.
[8] . Pohlc-Rüling J et al:in Natural Radiation Environment (KG Uohra et al eds)1982, pl08~113, Wiley Eastern Lid. New Delhi.