title: Study on migration behaviour of 237Np and 241Am in near-surface environments.
abstract: Laboratory-scale experiments were performed to investigate migration behaviour of (237)Np and (241)Am, which were deposited onto the ground surface from spent fuel reprocessing facilities. Migration experiments by column method were conducted for a sandy soil and a reddish soil by varying the volume of eluting solution. There seemed to be two chemical species of (237)Np in the sandy soil column: one is cationic and the other is particulate form. The particulates moved without significant interaction with the sandy soil. The sorption of cationic (237)Np was controlled by both a reversible ion-exchange reaction and irreversible reactions. Most of (241)Am was formed into rather large particulates and trapped in the sandy soil column. The (237)Np and (241)Am loaded into the reddish soil column moved deeper with increasing eluting volume. The sorption was mainly controlled by ion-exchange reaction. The migration behaviour might be evaluated by the distribution coefficient.
authors.affiliation: Japan Atomic Energy Agency, Shirakata 2-4, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan. tanaka.tadao26@jaea.go.jp
authors.forename: Tadao
authors.initials: T
authors.lastname: Tanaka
authors.forename: Nanthavan
authors.initials: N
authors.lastname: Ya-Anant
mesh_terms: D000576:Americium / Q000737:chemistry*; D004784:Environmental Monitoring; D009405:Neptunium / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D012987:Soil; D012990:Soil Pollutants, Radioactive; D009405:Neptunium; D000576:Americium