title: Residence times of global weapons testing fallout 237Np in a grassland soil compared to 239 + 240Pu, 241Am, and 137Cs.
abstract: The vertical distribution of weapons testing fallout 237Np has been determined in an undisturbed grassland soil (Alfisol). By using a compartmental model for multi-layered soils, the mean residence half-times of 237Np in each soil layer were calculated and compared with results on weapons fallout 239 + 240Pu, 241Am and 137Cs in the same soil. The results show that the mobility of 237Np was in most soil horizons either equal or slightly enhanced as compared to that of Pu, Am, and radiocesium.
authors.affiliation: GSF-Forschungszentrum für Umwelt und Gesundheit, Institut für Strahlenschutz, Neuherberg, Oberschleissheim, F.R. Germany.
authors.forename: K
authors.initials: K
authors.lastname: Bunzl
authors.forename: H
authors.initials: H
authors.lastname: Kofuji
authors.forename: W
authors.initials: W
authors.lastname: Schimmack
authors.forename: A
authors.initials: A
authors.lastname: Tsumura
authors.forename: K
authors.initials: K
authors.lastname: Ueno
authors.forename: M
authors.initials: M
authors.lastname: Yamamoto
mesh_terms: D000576:Americium / Q000032:analysis*; D002588:Cesium Radioisotopes / Q000032:analysis*; D009405:Neptunium / Q000032:analysis*; D009689:Nuclear Warfare; D011005:Plutonium / Q000032:analysis*; D011847:Radioactive Fallout / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D011847:Radioactive Fallout; D012990:Soil Pollutants, Radioactive; D011005:Plutonium; D009405:Neptunium; D000576:Americium