parts of the sampling network were chosen on the basis of uniformity of specific activity
throughout the sampling period. These areas represent the northeast, northwest, southeast,
and the southwest sections of the continental United States. The data for each of these areas
is plotted in Fig. 3.
|
|
|
4
6
8
RAINFALL, IN.
oT ee a
*
Sr? MC/SQ MILE/MONTH
| 9
40
Fig. 3a— Regression of Sr® in rain water on the amountof rainfall collected March through
Sr? MC/SQ MILE/MONTH
July 1956 at Caribou, Nantucket, and Stephenville.
|
4
2
RAINFALL, IN.
Fig. 3>— Regression of Sr® in rain water on the amount of rainfall collected March through
July 1956 at International Falls, Glascow, Helena, Boise, and Spokane.
3
!
|
[
x
re
z
S
<2
r—
rey
a
=
9
ei
o
=
~
e
oe”
if—
®
%
°
5
e
°
*e
e
2
°
4
e
l
6
3
RAINFALL, IN.
|
40
{
42
44
Fig. 3c — Regression of Sr® in rain water on the amountof rainfall collected March through
July 1956 at Tampa, Tallahassee, Jacksonville, and Charleston.
356