fishes is not known and the chemical form in which the radio-
i
nuclides are present 4n the lagoon waters can only be surmised.
We do not even know,
for example, whether the radionuclides
and their stable isotopes are present in the same chemical form.
Furthermore, there are no uncontestable data on the trace element
content of lagoon waters and probably will not be until the
techniques of sampling and processing seawater samples is greatly
improved.
However,
some hypotheses can be made and conclusions
can be drawn from certain data.
All of the fallout radionuclides at Bikini are found in
the surface of undisturbed soils.
in 1969 were Fre,
6005,
oon,
The predominant radionuclides .
906,
1256,
13765,
and 20753.
In the crater sediments only four predominate: re,
and
2
e
*
69%,
°
20 Sr,
:
.
O75: , although many more are present in smaller quantities.
The soils and sediments are now the principal reservoirs of radionuclides at Bikini.
The radionuclides are available to the land
animals through the vegetation, or other animals, where there
is selection of specific radionuclides, or through direct ingestion of soil.
In the latter case, the animal selects certain
radionuclides from a wider variety of nuclides than is in the
vegetation.
Similarly,
Eneregy
nt sof Offic
rtmerian’
pepaHisto
ARCHIVES
the marine animals may ingest radionuclides by
eating another organism or by ingesting sediments.
In addition,
the marine organism may absorb radionuclides directly from the
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