4
An
Gamma srectra were determined on plankton from station 4e
and on portions of this
samrle
tive filtrate, the Pe (OH),
3
including the formalin preserva-
scavenge from the ashed plankton
sample, and the cobelt separation on the same specimen (Fig. 12).
The total plankton sample has a lower n° component than that
found in sample 54.
In addition Ce
14h 5 lad RytF_ pp? a
nd
Zr?°-Nb?> contributes little of the total gamma radiation
(Fig. 12).
The major part of the gamma activity is contributed
by Co?" C028 and C0, also a limited amount ofr Fe>? is present.
The cobalt in plankton sample 42 is partly soluble in neutrel formalin 6nd is found in high amount in the filtrate.
Al144
144
though some evidence cf the Ce
~Pr
peaks are present inthe
planxton curve on the low MEV range, the curve on the filtrate
gives only the Co! petx (Pig 12, tnset).
This peak 48 also
shown by the cobalt seperation from plankton sample 42 in the
same figure.
In summary,
ucts
the
gémma-spectrs findings on non-fission prod-
in both the Welton end Marsh plankton samples are as
fcllows:
Station
Levels
zne-
Walton 8-C
Marsh
9-D
low
54
+4
4a
4
5
55
+
+
#
n.d.
+ 4
+ +
t 4
very high
high
not detected
of non-fission product isotopes
Cobalt isotopes
Pe?
+ +4
n.a.
n.d.
n.d.
low
n.d. po
low
low
4
+4
n.d.
n.d.
+
ARC