he
Station 5 is located 160 miles southwest of Fnivetok and
station 55, 90 miles due north of Eniwetok (Fig. 1).
Plankton
from stations 5 and 55 yielded similar radiochemical analytical
results and in eddition have almost identical gamma spectra,
which are essentially the same as thet of the plankton samples
from one of the neighboring stations, 54 (Fig. 11).
Station 42 wss taken 470 miles west of Eniwetok.
The iso-
topic content of plankton from this station was clearly differ-
ent from that of stations 5, 54 and 55 on the bases of both
chemical and ganma spectrum analysis.
Compartsons of the relative activity of the different tsotopes from plankton at stations 5, 55 and 42 as determined by
chemical analysis with the expected activity based on the
Hunter and Ballotlcurves are as follows:
Isotope
gp99 90
cs?
Bal37.140
Expected
percent *
Observed percent at stations
5S
and
7.5
0
él.
él.
0
<1.
55
ha
1.5
0
41.
colt pptt4
16.
8.2
Triv. R.E.
15.
4.5
5.1
3.0
3.0
Rut? Rut _pptO
zr’?
5.90
12.5
Coo! 298,60
Q
an°?
0
28.
3.0
ol tt
20.
el.
31.
6.0
*
Based on an average 8-month interval following detonation.
+
According to the gamma spectrum,
Zn
65
saacounts for approxi-
mately 50 percent of the total activity at stations 5 and 55.