title: Studies with natural and anthropogenic iodine isotopes: iodine distribution and cycling in the global environment.
abstract: Iodine is an important trace element in geological and biological processes. We summarize here recent results and new data of experiments and observations carried out to improve the understanding of concentration levels and behavior of natural and anthropogenic iodine nuclides in the global environment. The distribution of stable iodine in the Earth's crust was estimated using concentration data in a suite of representative samples and the influence of subduction on the marine iodine cycle was investigated using (129)I systematics on iodine-rich brines from Japan. The importance of microorganisms for the natural iodine cycle is shown in recent studies of iodine sorption on soil and of iodine volatilization from terrestrial and marine environments. Levels of anthropogenic (129)I were measured in samples collected around a spent fuel reprocessing plant in Japan.
authors.affiliation: National Institute of Radiological Sciences, Anagawa 4-9-1, Inage-ku, Chiba, 263-8555 Japan. y_murama@nirs.go.jp
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Muramatsu
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yoshida
authors.forename: Udo
authors.initials: U
authors.lastname: Fehn
authors.forename: Seigo
authors.initials: S
authors.lastname: Amachi
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Ohmomo
mesh_terms: D004784:Environmental Monitoring; D007455:Iodine / Q000032:analysis*; D007456:Iodine Isotopes / Q000032:analysis; D007564:Japan; D012623:Seawater / Q000737:chemistry; D012988:Soil Microbiology; D012990:Soil Pollutants, Radioactive / Q000032:analysis* / Q000378:metabolism; D014835:Volatilization; D014871:Water Microbiology; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D007456:Iodine Isotopes; D012990:Soil Pollutants, Radioactive; D014875:Water Pollutants, Radioactive; D007455:Iodine