correlation cosfficient obtained, using the gummed film data
(7), s
os
This relae
dicted Sr
90
,
90 ,
and rain water data as measured Sr*
pre-
.
is 0.49.
tionship is shown in figure 5, using the month of May as an illustration.
The ratios of average sr7° in rain to average sr?° in gummed film, range
from 1.9 te 45.
Table 6.
Table 6 is a summary of this comparison.
Comparison of sr?° in gummed film to sr7° in rain water.
Sampling
Month
Average sr70
in rain water
Average sp70
in gummed film
March
1.2
Oot
207
0.2
April
lol
0057
1.9
0.29
May
1.6
Ooi)
11
O19
June
1.0
02022
Ls
0.02
July
1.5
0.063
aly
0.01
(me/mi@/mo )
(me/ni=/mo )
Ratio
Correlation
Coefficient
CONCLUSIONS
The relationship between fallout in rainfall with total fallout
measurements using the pot type of collector is good, but there is poor
agreement between the rain water data and gummed film measurements.
It
is believed that the sr? values calculated from gummed film activity
are low due to incorrect arbitrary burst assignments used in the
caloulations. (©)
Considering only the rainfall data, no overall correlation exists
between rainfall and the level of sr?° activity.
It is interesting that
although the testing of atomic weapons takes place in southern letitude:,
tne sr70 deposition is higher at northern latitudes.
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