ig
Tatle 2.
The
sume
of activity of the residue from
of the velues
one liter of sea weter and
filtered water,
of the
less K >,
Figure 4
each station and depth ere given in Table 2.
for
ts a graph-
je presentation of the dete from Tetle 1 elong with the plankton
vealue#.
It is evident from this figure that although the abso-
lute values for the various derths
ent,
or kinds
of samples are differ-
the general pattern of horizontal distribution of activity
te approximately the same.
surfece water samples
The distribution of activity in the
is plotted
in Figure 5.
The highest levels of total activity in the surface water
(residue on filter peper plus filterable portion, less Kt) were
found tetween Tniwetok and Ujelang, and the lowest value north.
east of Bikini.
These values were 19,000 d/m/l and 48 d/m/l.
Velues in the vicinity of Guam are 4 to 20 times the lower velue,
indicating thet some ccentaminattion from Operation Recwing had
reeched this
far,
Pcssible interpretations of
the relation-
ship between water and plankton activity are discussed on pages
e7 - 33.
At every depth sampled the particulate matter retained on
the filter had lower levels of activity than did the filterable
fraction; this was
true also for the Walton samples with the
exception of the surface water,
in which the particulate matter
contained 58 percent of the activity.
Gioactivity
DOE ARCHIVES
The average values of re-
in the two fractions and the percentages from both
the Marsh and Walton data are presented for comparison in Table
3.
In both sets of data the particulate matter contributes
about three times as much of the total activity in the surface
2s