19
4.
Collection of rain water which has percolated through undis-
turbed soil shows that Cs
Ce
144
137
,
Ru
106
.
-Rh
106
,
2c
95
-Nb
95
”,
Sb
125
and
yo
are being leached from the soil in very small but as yet
undetermined amounts.
5.
Cs
137
.
.
.
+
oe
is the principal long-lived fission product taken up
by the plants.
The csi?” levels are higher in older leaves than
in younger leaves.
6.
There is a general potassium deficiency in the area.
Fertili-
zation experiments indicate that the potassium levels are associ.
ated with Cs
7.
137
uptake by the plants.
Variation in all types of soil and biological samples is com-
monly as great as by a factor of five for a given type sample
taken in an area of less than one square mile.
8.
Evaluation of calcium levels in the soil in terms of absolute
levels of available calcium is very difficult.
although these are highly calcareous soils,
It is clear that
available calcium
represents a small fraction of the total calcium.
.
tant relative to Sr
9.
90
This is impor-
uptake.
In general csi ?? and sr?° are the principal long-lived isotopes
found in the land organisms while zn°>,
co°?,
mn>* and Fe>> are
found in the marine organisms.
The need for
future
studies on fallout
in the ocean is in
general similar to the needs for studies in the ocean related to