are calculated from R-values averaged throughout the cloud for the first. four
hours,
The fractions for Oak are also from averages, here in the light
and variable stratum, while for Walnut the stabilized condition shown in
Figure 3.1 is used.
Sample 980 L for Oak is not included due to the poor
sampling conditions.
The fractions of these nuclides remaining in the cloud after one day
are given in Table 3.2.
These numbers are to be interpreted as the quan-
tity of material which does not come down in the local area,
The limits
assigned are derived from the variability in the data.
f
TABLE
VERO EN”
3,2
-
oo
2
FRACTIONS OF NUCLIDES LEFT IN CLOUD AFTER ONE DAY
Mo??
Koa
sr 79
.
Cs137
44
20
64
Walnut
3045
41
78
Oak
15 £10
45
61
Of the curves for the fraction of Mo?? left in the clouds, the one for
the water surface burst shows to a considerable degree the behaviour anticipated when the project was planned.
On the reef shot, the points appear
to be fluctuating around a fraction of 0.15, whereas for the land surface
detonation there is insufficient data to do anything but extrapolate beyond
SAN BRUNO FE KC
4s
oe te
:
6.5 hours,
Since it is likely that the fission ratios would
be around one
a
7