82_ Peter Stille and Graham Shields
WATER / PARTICLES
!gDfNE t31
~ > O . O S p m
13.5%1
(:~) ~
<
00Spm (96 5e/. I
TELLURIUM 13;~
~
>O.OS ~m (1:L7 %)
@ ~ < 0 . G s ~
ca63-/.)
RVTHENI U~ T03
CESIUM t37
PARTICLES
~ "
> O.t.5 ~,m 172.6"/ol
TELLURIVM 13~
~
0.2-O,O51Jm ( 9.6%}
~
> 0.45pro ( 798 ~
RUTHENIUM t03
~
O,2-QOSym (9.6 %)
0 ~ ~
0 t,5-0.2 pm ( 15 6 "/. )
~
:>O.t.5 pm (74.8%)
(;'~ SlUM 137
~
~
0.2-005 pm ( 13.7 % }
~ :>O.c5~m (7"2.3%)
Fig. 4,31. Activity distribution in river water (Glatt, Switzerland) between the dissolved
(<0.051am) and the particulate fraction (>0.051am) and among the different size fractions of
the particles. (Waber et al. 1987)
The groundwater samples come from sources that were 2.5 m and 5 m beneath the
river bed. Groundwater samples that came from greater depths showed no activity
and were thus not contaminated by the fall out after Chernobyl (Table 4.8). As
with river water, the filtered groundwater shows strongly enhanced radioactivities
compared with the material in suspension/colloids. Less than 2.5% of the
investigated radionuclides could be detected in the colloidal phases. The