Co?7,
C069,
contain
gn65 ,
sr90,
cel44
The corals
Co 60 anda are the only invertebrates in which sr? has
been consistently detected.
far it
and probably Euls5 ,
From limited data available thus
appears that these isotopes were deposited
in
the
skeletal material soon after fallout and have remained localized in portions of the coral colony actively growing at that
time.
The clams contain mostly gn©>,
and Shipman
(1957)
Co?? and co®9,
Weiss
originally reported the concentration of
co69° in the kidney of Tridacnid clams collected at Rongelap in
1956.
Animals such as the sea cucumber and spider snail,which
ingest large amounts of bottom sediments,contain Rul,
cel44
and probably Eut55,
Of several species of algae sampled in 1959 the only radionuclides detected were RuL06 |
cel44 ang Eul55.
In general,
the
levels of radioactivity in the algae are lower than in the fish
or invertebrates.
The plankton contain mMn>4,
cel44 put all in minute amounts.
Co>7,
gn®> |
zr?>,
Rul|
and
In 1959 plankton samples col-
lected by pumping a total of two and a half million gallons of
water
were pooled for gamma spectrum analysis and were found
to contain
only enough of
these isotopes
for
qualitative
analysis without resorting to chemical separations.
Further
analysis has been deferred until other studies with the individual samples can be completed.