6 em ele
prediction of concentrations in fruit
papaya > Pandanus and banana > Nesser-
of one species from those in fruit or
sehintdta and
leaves of another species.
(Tables 15 and 18).
These
ratios show that distribution patterns
eaevola > coconut
These
results
1
for each nuclide are consistent within
agree with those of Welander.
.
7
a particular species.
various species differs slightly from
However,
The relative uptake of
we
_
of
must remember that the importance of
that
the contribution of each nuclide
Leaves,
the internal dose
to
to man varies with
906
For
137
Cs
Cs by
the
.
in mature
the concentration appears
to
decrease with Pandanus > Seaevola >
different species.
Messerschmidta, coconut, and papaya >
The fruit-fruit and fruit-leaf
breadfruit > banana.
A comparison of
concentration ratios are calculated
37 o, uptake by fruit yields
from a comparison of
pattern:
the concentration
factors of three plant groups
(plants
the
papaya > FPandanus and
breadfruit
> coconut
(Tables
16 and
within each group were sampled from
19).
the same general location) and from
239,240), | by mature leaves are much
comparisons of
more limited
the median concentra-
The data tor the uptake of
than data
for 706). and
tion ratios of all associated plant-
IS To,
but preliminary results sug-
soil samples (Table 14).
gest:
Messersemntdia > breadfruit >
Analysis of
the concentration ratios
for mature
leaves and fruit suggests
Pandanus and coconut > papaya >
~
that some
Seaevola and banana {see Table 17).
species concentrate a given nuclide
Although no concentration ratios are
to a much greater extent
calculated,
others
(Tables 315-19).
than do
For I06,.
the uptake of
90.
Sr and
137
tae
.
~ Cs by unfertilized summer squash
in
mature leaves,
the concentration de-
exceeds that of all other edible
creases
order:
plants sampled.
in
the
breadfruit
and
Summary and Conclusions
The radionuclide concentration in
the concentration at
depths as great
surface sotl samples (0 to 15 cm)
as 120 em excecds that in the top
varies greatly throughout both Bikini
2.5 em.)
and
ability in surface soil concentrations
Eneu Yslands.
In addition
to
the
As a
result of
the vari-
inhomogeneity observed in surface
with lecation and with depth,
soil concentrations,
sions regarding dose reduction via
indicate that
tration as a
profile data
radionuclide concen-
soil
function of soil depth
is guite variable.
ereat
(In some cases,
Ms
removal must
care.
It is
conclu-
be exercised with
nearly
impossible
to generalize about remedial measures
—-31-