in Tables 16 and 17 by weighting by
of Bikini and Enewetak data on bird
sample size and by assuming that
muscle and liver, we are listing in
detection limit values ("less than"
Table 20 the Pu concentrations from
numbers) were actual concentration
the Enewetak Radiological Survey. >>
values.
The 10-, 30-, 50-, .and 70-yr inte-
Table 18 lists the final
radionuclide concentrations that were
gral doses resulting from ingestion of
used along with the estimate of fish
marine foods are given in Table 21.
ingested per day (600 g/da) to calcu-
Strontium-90 contributes the largest
late the radionuclide intake via the
fraction of the bone marrow dose (70
marine food chain (pCi/da).
to 80%), 13766 contributes approxi-
The table
also includes the concentration of
mately 20%, while 600, and 239,240,
some radionuclides in fish used in the
contribute about 64 of the total.
1973 Enewetak assessment.
whole body dose from the marine path-
The
way is 50 mrem for the integrated
The species of birds that are
readily caught and included in the
30-yr dose and 66 mrem for the 50-yr
diet are marine feeders, mostly
integrated dose.
-species of terns.
The bone marrow
doses are 200 mrem and 290 mrem for
Therefore, the
radionuclide concentrations in their
the 30-yr and 50-yr integral doses,
muscle tissue are similar to that in
respectively.
the marine diet.
are small relative to those from other
For this reason,
These integral doses
birds and bird eggs are considered
pathways.
part of the marine diet for the pur-
contributes a relatively significant
239,240,
fraction of the total
u intake,
poses of dose calculation.
No birds
Although the marine pathway
or bird eggs were collected in June
Table 18.
1975, so the data used to evaluate
this part of the marine food chain
come from previously published
|
8,31,32
reports
and are summarized in
Table 19.
Average weighted® radianuclide concentrations in
fish and clams at Bikini
Atoll.
Concentration,
The final concentration
pCi/g Wet Weight
data used for dose assessment listed
in Table 20 were derived assuming that
six times more bird muscle is consumed
Species
6006
1376,
0c,
Tish
1.51
0.14
0,076
0.0028
Clams
2.06
0.011
0.0060
0.0072
than liver and that the wet-to-dry
ratio is 0.33 for muscle and liver and
0.25 for eggs.
Because of the absence
of Pu concentration data on birds and
bird eggs on Bikini and the similarity
'Enewetak Atoll 1972 Dose Assessment
Fish
2.0
0.39
0.075
—
“Weighted by number of fish or clams
in the sample.
-27-
5009911
239, 2405,