RADIOACTIVITY IN PRECIPITATION
700
a
ae
Ssv -
TT
TT
541
TT
= 600
4
:
*
400 &
=
O
T
a
e
—-O-4
2.4
t+
bo
<
QO
w
2.0
WwW
oe]
4.0 2
S
2
416 2
a
a
=
im
Z
bx. OO
3.0 <
<
«
Oo
a
41.2 #
¢
we)
L_
—_
(5
>
<
a
5 200 --
ir
p—x——— x
z
5<
>
5.0 >
—”
< 300 L
)
6.0
<
———
J
be
2.8
--—
wl
g 500 |
s
7.0
2.0 >
Y
E
0.8 <
-
vs
o
Oo
<
2
100+
>
<
1.0
=
0
}-—«——«
|
0
1700
LL}
10
L
20
{
|
30
|
|
40
TIME, CST
x—{
i
|
50
0.4 Oo
=
s
—
|
[
60
]
0
0
10
1800
Fig. 9—Time cross sections of total beta concentration (solid lines),
rainfall rate (lines with x’s), and ratios of particulate to dissolved beta
activity (lines with zeros) for station 8 for storm of Apr. 23, 1964.
but the total beta concentration was not out of line with the values
obtained at station 8.
Analysis of radar data indicated that the collections at stations 5
and 7 were from the same rain area that passed over station 8. The
first collections were being taken from the leading edge of the storm at
station 5 at the same time the final sample was being taken from the
trailing edge at station 8. The rainfall center of the dissipating cell
passed four miles west of station 5. The radar storm top at this time
was at 34,000 ft and no longer penetrated into the stratosphere. Comparisons of the collection data from the leading edge at station 5, given
in Table 1, with those from the leading edge at station 8 show that the
total beta concentration at station 5 increased with time whereas the
ratio of particulate to dissolved beta activity decreased with time.
These occurrences are the inverses of the initial events at station 8,
but the magnitudes are in line. Table 1, which compares collections
between the leading edge and the trailing edge, shows that the betaactivity concentrations of the leading edge were slightly higher, 465 and
559 pc/liter, than the concentration at the trailing edge, 435 pc/liter.