4 Isotope Geochemistry in the Environment
79
10"
10 5
lOz
m
i
i
0 10~
tO o
10 -!
o~
O" 10z
m
I.---.J
o.
0 101
10 o
RHINE
,, .......
I ...........
I ...........
I ..........
I ...........
I ...........
1
1986
1987
1988
1959
1990
1991
MOSEL
L ~
i.rL ~
k,,, - 032a -I
"l.r'
.....
, ....
! ...........
I ...........
I .........
' ............
! ...........
I
1986
1987
1988
195g
I990
1991
Fig. 4,28. z37Cs activity in the suspended load from the Rhine and Mosel rivers between
1986 and 1991. (~lundschenk 1992)
They determined the contents of the radionuclides J~
13t I, 132Te, I-UCs and
t37Cs in river water and in groundwater. Sample collection took place from just
one to four weeks after the accident.
Tables 4.7 und 4.8 display the activities (Bq/l) of radionuclides in river water
and groundwaters. D stands for the dissolved phase and P for particulates/colloids.
From this we can observe that the particles/colloids transported less than 25% of
the radioactivity into river water. The main activity could be detected in filtered
water. This means that the radionuclides investigated here exist in molecular
solution or were adsorbed onto very small colloids (<0.05pro). Fig. 4.31 shows
the distribution of activity in dissolved and particulate phases in river water.