19
4.
Collection of rain water which has percolated through undis-
turbed soil shows that Cs
Ce
144
137
,
Ru
106
.
-Rh
106
,
& xr
95
-
Nb
95
c
Ss
b
125
and
,
1g
are being leached from the soil in very small but as yet
undetermined amounts.
5.
Cs
137.
,
.
os
is the principal long-lived fission product taken up
by the plants.
The cst 3? 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.
137
ated with Cs
uptake by the plants.
7.
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.
This is impor-
.
90
tant relative to Sr
uptake.
9.
In general cst3? and sr?° are the principal long-lived isotopes
found in the land organisms while gn°?,
C08?
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