4
The results: of the analysis of the radionuciides in sanmples from station 42 differ from those #t stations 5 and 55 in
that the levels of colt4_pplk4 end Co57-58,60 ane respectively
2.5 and 10 tines higher at 42; &
2091 90 ts absent at 5 and 55,
but present et 42 at a level of about 20 percent that expected
from the Hunter and Bailou
spectrum curves.
tion of Ce
Yak
-F
however,
14s
10
curves.
On the bests of the gamma
the apperent radiochemical determina-~
in sample 42 is too high.
In plankton from all three stations the trivalent rare
earths are present at about 30 percent and Rut?3 RytOb_p),206
&ét about 50 percent of the expected levels.
nand,
Zr?>,
on the other
is present at ea level about twice that expected.
The total recovered activity in the chemical separations
greeter than that ususlly found.
counting the original sample
nal
is
This may be due to error in
introduced by the presence of appre-
ciable emounts of Co’, co,
60°? and 2n°> » 11 of which emit
relatively low energy beta particles in comparison to those from
mixed fission products.
The gamma spectra of plankton from Marsh atations 5, 54
and 55 indicate a low percentage of cobalt
level
of Zn
65 ’
isotopes, but a high
approximately 50 percent of the total ganma emis-
sion) along with nn Zr? ~Nb?> and Ry26_pp206 (Pig. 11).
At station 54, gamma spectra were obtéined for sea water
oor
after filtration through a Millipore filter, for plankton, and
a flying fish liver (Pig. 11).
fish liver sre similar.
The curves for the plankton and
All of the detectable gamma activity
in the water, however, was contributed by zr? °-Nb?> »