~17-
calities,
arly
eeper
calities.
e slopes
The decays for sea water are given in Table 6 and Figure
11. Counting errors were large because of the low levels of
nearly 811 of the Jater counts. The contribution to the
was compensated for by subtracting 1
radioactivity by
from each count per minute per 5 milliliter plate.
per minute per plate was equivalent to 3 d/m/plate,
Olive
One count
because
the correction factor for geometry, back scatter, and self
absorption was approximately 3.
Table 6. Decay rates of sea water samples collected at Eniwetok
Atoll in May, June,and July 1954, with corresponding decline
rates from Table 1 for comparison.
Data for Fig. 11.
Curve
Plate
Locality
number numbera
Time span in Slope, perative
days after
58/14/54,
of
Decay
decay slope
1
2
3
4
5
6
7
8
9
7567-68 Belle, ocean side
7869-70
*
®
"
7575-76
*
plankton station
7585-86
"
ocean side
9805-04
*
lagoon side
9793-94 Wide Passage
71672
Leroy plankton sta.
916i
”
"
®
9795-96
"
«
"
53-630
335-650
55-910
39-650
from
Table 1
1.5
1.5
1.5
1.28
1.28
2.30
1.0
1.2
1.5
1.5
1.4
2,91
2.40
2.41
2.41
2.41
1.5
100-600
100-300
55-940
49-940
100-300
Decline,
1.28
10,000,
The data of Table 6 for the
r sea
at
9 sea water decays are graphed in
Figure 11.
Belle,
1900
With the exception of
ocean side (curves 1, 2,
RADIOACTIVITY
values, declines were steeper than
decays.
.-The decay curves tend to
level terminally, even after subtraction of the activity due to
K
6a_
wv
435] e
-
a
and 44 where decline was unusually
gradual because of low early
19
e
r
TOO
DAYS AFTER any 14, 1994
Fig. 11