CLEARING EXPERIMENT EXPOSURE RATES
(ux/hr)
Radius of
Cleared Area
0!
10'
20'
30!
13745
B° a9
47.2
48.6
50.8
52.2
5.2
5.2
5.5
5.7
125 op
Total
9.1
8.6
8.0
8.5
61.5
62.4
64,3
66,4
As
59.0
59.0
59 9
60.5
The slight increase in the total of the *°’Cs, °°co, and
+25 sh exposure rates indicates that there is possibly some
increase in the unscattered gamma radiation affecting our
partial exposure rate estimates, but there is a corresponding
reduction in the scattered radiation and thus little effect
on the total exposure rate.
The more important effect of
the vegetation seems to be to enhance scattering of the
radiation from emitters in the soil thereby producing a
slightly softer energy spectrum.
This effect more than conpensates for the increase in exposure rate at the detector
due to radiation originating in the vegetation itself.
The quantity of vegetation removed was staggering.
As
the brush was removed from the area, it was identified and
weighed.
These statistics are given below.
~
VEGETATION REMOVED
Area
Scaevola
Pounds
ra $2
IN CLEARING EXPERIMENT
Dodonea
Litter
of Aerial Portions
10 £t. radius
10 - 20 £t. radius
593
1717
33
112
59
364
20 —-
2902
67
386
5212
212
809
30
£t.
radius
Total
4