239+240Pu, 90Sr and 137Cs inventories in surface soils of Vietnam.
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.
Quang
N H
NH
Institute for Nuclear Science and Technology, Cau giay, Hanoi 5T-160, Viet Nam.
Long
N Q
NQ
Lieu
D B
DB
Mai
T T
TT
Ha
N T
NT
Nhan
D D
DD
Hien
P D
PD
D004784:Environmental Monitoring; D011847:Radioactive Fallout / Q000032:analysis*; D011868:Radioisotopes / Q000032:analysis; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D014744:Vietnam
D011847:Radioactive Fallout; D011868:Radioisotopes; D012990:Soil Pollutants, Radioactive