The long-term dynamics of radionuclides in soil solutions of various s
ubhorizons of litter and mineral layer of soddy-podzolic sandy forest
soils at 30-km zone around Chernobyl nuclear power station was studied
. One year after the accident the relative contents of Sr-90, Ru-106,
Cs-134,Cs-137 Ce-144 in soil solutions (radionuclide fractions in the
liquid phase of soil) for the whole contaminated layer of soil were ve
ry low (0.034-3.5%) and varied from one plot of zone to another becaus
e of unequal physico-chemical properties of nuclear deposition. By 198
9 this parameter for radiocesium decreased 5-9 times and then varied s
lightly The data indicate that since the accident three processes have
taken place: radiocesium transfer from fallout into soluble forms, it
s migration down the soil profile and fixation of radionuclide in orga
nic-mineral layer of soil under the forest litter. (C) 1998 Elsevier S
cience Ltd.