42
Station 5 1s located 160 miles southwest of Fniwetox and
station 55, 90 miles due north of Eniwetok (Fig. 1).
Plankton
from stations 5 and 55 ylelded similar radiochemiceal analytical
results and in addition 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 was taken 479 miles west of Fniwetok.
The iso-
topic. content of plankton from this station was clearly different from that of stations 5, 54 and 55 on the bases of both
chemical and ganms spectrum analysis.
Comrarisons of the relative activity of the different iso-
topes from plankton at stations 5, 55 and 42 as determined by
chemical sanalysis with the expected activity based on the
Runter and Ballod?curves are as follows;
Isotope
gr99 90
csi37
Bal37,140
Expected
percent *
7.5
<1.
<2.
Observed percent at stations
5
and
0
0
<1.
55
4o
1.5
0
é1.
cont t_ ppt tt
16.
8.2
Triv. R.E.
15.
b,5
5.1
Ru, Ru? 6p30
zr?>
5.0
12.5
3.0
28,
3.0
21.
C97! 98260
an°?
0
0
3.0
~w 1
20.
s
ye
31.
6.0
*
Based on an average 8-month interval following detonation.
7
According to the gamma svectrum, Zn65 accounts for approxi-
mately 50 percent of the tots] activity at stations 5 and 55.
“ae