Reload Index (ZRiChK UMCS)
MIGRATION OF RADIONUCLIDES IN SOILS AND THEIR
ACCUMULATION IN SEDIMENT OF SUPERFICIAL WATERS,
STUDY ON MIGRATION OF RADIONUCLIDES IN THE BUG RIVER
STANISŁAW CHIBOWSKI, ANDRZEJ KOMOSA,
MAREK RESZKA, JAN SOLECKI, JACEK ZYGMUNT
DEPARTMENT OF RADIOCHEMISTRY
AND COLLOID CHEMISTRY
As a continuation of the study within the project supported by
International Atomic Energy Agency the horizontal and vertical migration of
radionuclides (natural and artificial origin) in the Bug River valley was
investigated. From the river valley ten sampling sites were chosen, where
surface soil (near a riverbank and at 20-50 m distance) and sediment samples
were collected. Independently, in every sampling site a soil profile was
exposed and the samples were taken down to 30 cm (6 layers). Concentration of
natural gamma emitters such as: 40K, 214Bi, 226Ra,
212Bi, 228Ac and anthropogenic 137Cs was
determined in every samples by means of gamma spectrometry. The results of
natural radionuclide concentration in the points along the Bug River show any
regularity in its level changes along the course of the river. There is no
difference in specific activity between soil and sediment samples (in the case
of natural radionuclides). As the example the 40K concentration
change along the Bug River is presented in Fig.1. In the case of the artificial
nuclide - radiocaesium - its concentration in soil samples is about 4-times
higher than in river sediment (and equals about 22 Bq/kg). Fig.2 shows the
changes of radiocaesium activity level along the Bug River.
Figure 1. The 40K specific activity in sediment (point A) and two soil
samples (point B - near the riverbank, and C - in a longer distance) collected
along the Bug river.
In examined soil profiles of the Bug river natural isotopes reveal
rather uniform distribution between the layers of soil, as is seen on Fig.3 in
a case of 40K. Radiocaesium behaves just opposite - there is a very
great difference in cesium concentration between upper soil layer and the
other, deeper layers. It means that migration rate of cesium is very slow. Fig.
4 presents a distribution of radiocaesium between the layers of the soil
profile. These informations can be used to calculation
of velocity of radiocaesium vertical migration in soil.
Figure 2. The 137Cs
specific activity in sediment (point A) and two soil samples (point B - near
the riverbank, and C - in a longer distance) collected along the Bug river.
Figure 3. Vertical
distribution of 40K activity in soil samples of the Bug river (in ten points
along the river).
Figure 4. Vertical distribution of 137Cs activity in soil samples of the
Bug river (in ten points along the river).
Grant IAEA 10075