Nuclear Technology Laboratory
Health Physics Society : Volume 69, Issue 6 , December 1995.
Radiocesium distribution in undisturbed soil: measurements and diffusion-advection
Antonopoulos-Domis, M; Clouvas, A; Hiladakis, A; Kadi, S.
The profile of 137Cs, due to Chernobyl accident, in undisturbed soil
was measured experimentally over the years 1987 to 1994 and was found
to remain practically fixed in the upper 30 cm of soil since 1987.
Total deposition of 137Cs at the site was 20 kBq m-2, and approximately
80% of that is in the upper 10 cm. The profile has two slopes in semilogarythmic
scale, i.e., it appears as the sum of two exponentials. The contribution
of weapons fallout is found to be negligible. Pure diffusion and diffusion-advection
models of cesium migration are investigated. It is found that the
pure diffusion model cannot reproduce the double slope, while the
diffusion advection model can. [Journal Article; In English; United