Civil Engineering Reference
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137
Cs
90
Sr
Concentration, Bq/kg
Concentration, Bq/kg
1
10 00
1000
10000 100000
100
1000
10000
0
-20
-40
-60
-80
-100
Figure 3.15
Vertical distribution of radionuclide concentrations in rock samples:
90
Sr
(observation plot Veresok, CEZ) and
137
Cs (observation plot Liutezh, Kyiv region) according
to postaccident data. Dashed line, depression center; solid line, background area.
Figure 3.15. The observed difference of radionuclide activities in the central parts
of depressions and background sites reached 2 orders of magnitude for
137
Cs and
1 order of magnitude for
90
Sr. This provides evidence of a higher relative intensity
of vertical radionuclide transport in the PFMZ.
3.5. Preliminary evaluations of PfMZ influence on
Upper groundwater
Let us consider a closed watershed area represented conventionally by two
landscape types: background and depression-related PFMZ. Let
F
s
=
F
b
+
F
a
(m
2
)
be the total watershed area;
F
b
and
F
a
be areas of background and depression
PFMZ sites, respectively; and
W
b
(m/day),
C
b
and
W
a
,
C
a
be average infiltration
and contaminant concentration in groundwater at the groundwater table depth
at background sites and depression PFMZ sites, respectively. Then, the balance
equations determining the flow and contaminant mass balance within the water-
shed can be written in the forms
WF WF WF
ss bb aa
=
+
,
(3.1)
CWFCWF CWF
sss
=
+
,
(3.2)
b bb aaa
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