respectively) where removal of
the
samples
to allow preliminary predic-
top LO cm of soil would reduce soil
tion of concentrations in nearly all
concentrations by approximately five-
components of the postulated Bikini
fold.
diet.
This of course would result
These predicted concentrations
in reduced external exposure and
are based on soil~plant concentration
reduced uptake
Factors and on fruit-leaf,
in plants grown in
such areas.
or fruit-fruit concentration ratios
Although considerable variation in
soil
leaf-leaf,
radionuclide concentration is
observed on both islands,
calculated from the 1975 field data.
The predicted concentrations compare
Eavorably with the available measured
the soil
concentrations on Bikini Island are
concentrations.
approximately ten times those on Eneu
survey of Bikini Atoll with larger
Island.
sample sizes is needed to statistically
In addition,
the relative
A more extensive
radionuclide soil concentrations are
verify these preliminary results.
very consistent; concentrations of
90
137
,
Sr and
Cs are ten to twenty times
the meantime,
?
greater than those of 239,240),
L
;
Am which,
in turn,
0
times greater than
Therefore,
are two to
Co
potential
In
future concen-
trations in foodstuffs from Bikini can
nd
be predicted from our concentration
three
factors if measured soil concentrations
.
concentrations.
are available and from our conecentration ratios if only vegetation samples
generalizations can safely
be made from the soil data to the
are available.
etfect that inhabitants on Bikini
commitment expected
Island will be exposed to higher doses
jected Lifestyles From our predicted
than
concentrations are reported in Part §
those on Fneu tsland.
both islands,
Also,
on
906. and ae are the
of
)
concentrations
trations measured
:
from soil concen-
in the
the literature.
this report series.
13?
c
Cs, followed by 239, 240), ;
man from this pathway.
er
;
;
within a given species,
taken from
‘this approach was
magnitude greater than
programs were limited in the early
which, in turn,
surveys.
uptake by one to
the terrestrial
sampling program of the
and will
In general,
/
Cs uptake
by fruit and leaves is one order of
adopted because vegetation sampling
However,
Sx and
f
constitute the major internal dose to
Field and
from concentration factors
from various pro-
terrestrial foodchain are
in
terrestrial foodstuffs at Bikini Atoll
have been predicted
the dose
The predominant nuclides in the
vadionuclides of primary importance.
In the past,
Estimates of
L975 Bikini
niLlude.
survey included sufficient vegetation
Oc, up take
239,240
Pu
exceeds
two orders of mag-
Uptake by mature leaves af
papaya, banana, and breadfruit varies
—35-