Figure 2.
Comparison of monthly deposition for each milkshed and national average deposition
(collection station in parentheses)
NEW YORK CITY
74
ST. LOUIS (TULSA)
6+
54
Statlon
44
monthly
qme/miz2)
a4
o
Station
monthly
Cme/mi2)
T
t
2
National average
ra
7
Statlon
Station
monthly
(me/mi2)
monthly
rainy
Station
monthly
(me/mi2)
National average
1058
v4
a
a
>
@
NX
(mc/mil*)
SACRAMENTO
(WEST L.A.)
T
4
t
5
Ss
'
r)
Natlonal average
CINCINNATI (PITTS)
National average
r
3
SALT LAKE CITY
4+
aq
°
—
T
1
t
2
T
3
~
4
‘
&
os
8
.
7
National average
The relative constancy of this ratio can be dem-
onstrated by considering data collected by the
Public Health Service in Brainerd, Minn. (4),
and St. Louis, Mo. (6). In these studies measurements were made for the concentrations of
strontium 90 in both feed and milk for a number of cows on farms located within the milksheds. The data in table 1 show the computed
average observed ratios and their associated 95
percent confidence limits.
The variability in this ratio is very small,
the mean observed ratios in both milksheds lying approximately between 0.08 and 0.05. It is
interesting to note that a ratio calculated using
Public Health Reporis