title: Level and source of 129I of environmental samples in Xi'an region, China.
abstract: Iodine-129 is widely used as a tracer in various environmental practices such as monitoring of nuclear environmental safety, seawater exchange and transport, geochemical cycle of stable iodine and dating of geological events. The spatial distribution of (129)I concentration varies significantly on global scale because of anthropogenic input from nuclear activities coupled with scarcity of data on environmental (129)I variability in many parts of the world including Asia. Here we report new data on (129)I and (127)I concentrations in soil, vegetation, river water and precipitation collected from Xi'an area, China. The results indicate values for environmental (129)I/(127)I ratios in the investigated area range from 1.1×10(-10) to 43.5×10(-10) with a mean of 20.6×10(-10), which is 1-3 orders of magnitude lower than the ratios observed in Europe, but comparable with those observed in the locations far from direct effect of point release sources and at similar latitude. The main source of (129)I in the investigated area is attributed to the global fallout of both atmospheric nuclear weapons testing and long distance dispersion of fuel reprocessing releases.
authors: Xi'an AMS center and State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075, China.
authors: Luyuan
authors: L
authors: Zhang
authors: Weijian
authors: W
authors: Zhou
authors: Xiaolin
authors: X
authors: Hou
authors: Ning
authors: N
authors: Chen
authors: Qi
authors: Q
authors: Liu
authors: Chaohui
authors: C
authors: He
authors: Yukun
authors: Y
authors: Fan
authors: Maoyi
authors: M
authors: Luo
authors: Zhiwen
authors: Z
authors: Wang
authors: Yunchong
authors: Y
authors: Fu
mesh_terms: D000398:Air Pollution, Radioactive / Q000032:analysis*; D002681:China; D004787:Environmental Pollution; D007457:Iodine Radioisotopes / Q000737:chemistry*; D011834:Radiation Monitoring; D011847:Radioactive Fallout; D011850:Radioactive Waste; D045483:Rivers / Q000737:chemistry; D012987:Soil / Q000737:chemistry
chemical_list: D007457:Iodine Radioisotopes; D011847:Radioactive Fallout; D011850:Radioactive Waste; D012987:Soil