title: 239+240Pu, 90Sr and 137Cs inventories in surface soils of Vietnam.
abstract: Fallout 239+240Pu, 238Pu, 90Sr and 137Cs inventories in surface soils were measured for 20 locations in northern Vietnam yielding the mean values (+/- standard error) of 26.5+/-3.8 Bq m(-2) for 239+240Pu, 1048+/-143 Bq m(-2) for 137Cs and 212+/-28 Bq m(-2) for 90Sr. The concentrations of 137Cs and plutonium isotopes strongly correlate with each other resulting in a stable 239+240Pu/137Cs inventory ratio of 0.025+/-0.002. Among soil parameters, organic matter and fulvic acids strongly correlate with caesium and plutonium isotopes, especially in the 0-10 cm layer. 137Cs and 239+240Pu are distributed rather similarly over the 0-10 cm and 10-20 cm layers. At locations with high contents of sand (82-93%) along the South China Sea coast, the downward percolation by rainwater results in a higher accumulation of 239+240Pu and 137Cs in the 10-20 cm layer. The mean 137Cs/ 90Sr inventory ratio is 9.3+/-2.2, and the correlation is weak between these isotopes.
authors.affiliation: Institute for Nuclear Science and Technology, Cau giay, Hanoi 5T-160, Viet Nam.
authors.forename: N H
authors.initials: NH
authors.lastname: Quang
authors.forename: N Q
authors.initials: NQ
authors.lastname: Long
authors.forename: D B
authors.initials: DB
authors.lastname: Lieu
authors.forename: T T
authors.initials: TT
authors.lastname: Mai
authors.forename: N T
authors.initials: NT
authors.lastname: Ha
authors.forename: D D
authors.initials: DD
authors.lastname: Nhan
authors.forename: P D
authors.initials: PD
authors.lastname: Hien
mesh_terms: D004784:Environmental Monitoring; D011847:Radioactive Fallout / Q000032:analysis*; D011868:Radioisotopes / Q000032:analysis; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D014744:Vietnam
chemical_list: D011847:Radioactive Fallout; D011868:Radioisotopes; D012990:Soil Pollutants, Radioactive