ate ae
Stee ie
4 Mite
tee BD
ey te
:
at
Wee!
‘
te
BaWe
a CEade
;
i
aeeee PEALE rail algseiieaBashoar oe cleailae
a
s
calities.
arly
eeper
calities.
e slopes
OLive
\
he decays for sea water are given in Table 6 and Figure
11.
Counting errors were large because of the low levels of
Jater counts.
nearly 211 of the
The contribution to the
was compensated for by subtracting l
radioactivity by
from each count per minute per 5 milliliter plate.
per minute per plate was equivalent to 3 d/m/plate,
absorption was approximately 3.
Table 6. Decay rates of sea water samples collected at Fniwetok
Atoll in May, June,and July 1954, with corresponding decline
rates from Table 1 for comparison. Data for Fig. 11.
Locality
Pilate
Curve
number numbers
1
Time span in Slope, negative
days after
5/14/54,
7567-68 Belle, ocean side
2
3
4
7569-70
7575-76
7685-386
6
7
9793-94 Wide Passage
7572
Leroy plankton sta.
9
9795-96
5
8
9805-04
916i
"
j.“
“
"
"
*
"
"
plankton station
ocean side
lagoon side
"
"
"
"
33-630
335-630
55-910
59-6350
100-500
100-300
55-940
The data of Table 6 for the
Belle,
49-040
100-300
9 sea water decays are graphed in
Figure ll.
With the exception of
at
of
Decay
Decline,
from
Table 1
1.3
1.28
1.5
1.5
1.5
1.28
2.50
1.28
1-2
1.5
2.40
2.41
1.4
2.41
1.0
1.5
2,91
2.41
1000
ocean side (curves l, 2,
The decay curves tend to
level terminally, even after subtraction of the activity due to
KU,
FM
a
a
gradual because of low early
values, declines were steeper than
decays.
RADIOACTIVITY
and 45 where decline was unusually
W69_ 1435
because
the correction factor for geometry, back scatter, and self
decay slope
r sea
One count
oF