-10-
The
lagoon sediments contain sr29,
RuL06 |
cel44 and Eut55,
The radioactivity is associated mainly with the fines and is
concentrated in the top two to four inches,
dropping off
rapidly with depth.
Radioisotopes other than naturally occurring K40 were not
detected in sea water although larger samples and more sensitive techniques undoubtedly would have revealed their presence.
In sum,
on land,
fission products,
the present distribution of long-lived
sr?9 and csi37,
very much as they are now.
can be expected to remain
The levels of radioactivity will
be reduced primarily by physical decay of the radionuclides so
long as other factors such as changed agricultural practices
or a catastrophic storm do not occur.
In the lagoon,
the levels
of radioactivity will decline more rapidly than on land because
of the presence of shorter-lived radionuclides,
tion of sr?°,
with
the excep-
‘The latter does not enter the marine food web
to any significant extent and may remain as a tag useful in
evaluating the long-term effects of physical forces in the lagoon.