to identify the specific cause of
variation but
each
the variation can be
a faster rate than Wee
376, is
also readily absorbed and accumulated
reduced by carefully controlling
in organified soil horizons where
sampling techniques and by increasing
there is a proliferation of plant
the number of samples.
roots
Where fruit data are unavailable,
and litter.
This accumulation
of 13266 in organified soil horizons
concentration factors calculated from
renders it more available than 90,
mature leaf data are used as the
for uptake in plants.
basis for predicting concentrations
The concentration factors discussed
of radionuclides in food available
in the subsequent paragraphs generally
to the returning Bikini population.
reflect this relationship between the
Mature leaf concentration factors
uptake of
in conjunction with correlations
nus, coconut, Seaevola, and Messer-
between various
sehmidta leaves and for the fruit of
species and between
Oc. and 13766.
For Panda-
leaves and fruit of the same species
all species, low concentration factors
enable us
are observed for 90. as compared to
to predict concentrations
in fruit from measured concentra~-
Tog,
However,
tions in leaves of indicator or
banana,
and breadfruit show concentra-
edible plants.
tion factors for 905, as high or
We only report concentration
factors for 906
239,240
and
.
.
As predicted from previous
Pu.
studies,
137265,
the most effectively trans-
leaves of papaya,
higher than those for
137
Cs.
Concen-
239,240
tration factors for
,
Pu are
generally 10 to 100 times lower
those
than
for either 900, or 132 e6,
ferred radionuclide in the terrestrial
Although they are often measured in
environment
soil,
is
"Cs, although 705,
6066,
2H
and amare are only
is often present in larger quantities
occasionally detected in vegetation.
in the soil of the atoll.
For
This is
this reason, we did not calculate
partly explained by the differential
concentration Factors for these three
solubilities of 905, and 13% o6 in
nuclides.
soil.
Strontium-90 appears to be
In the following sections, we
tied up as insoluble carbonates in
discuss
the atoll soil and is thus less avail-
factors assigned
able to the plant.
Concentration factors are assigned
Cesium-137 is
the specific concentration
to each species.
more soluble in the nonclay atoll
solely on the basis of
soil;
calculated concentration factors
.
thus
137
.
Cs is more easily
leached through the soil. Although
137
.
‘Cs is leached through the soil at
the median
except for coconut and for pooled
Scaevolta and Messerschmidta leaves.