CLEARING EXPERIMENT EXPOSURE RATES
(ur/hr)
-Radius of
Cleared Area
Q'
10'
20'
30'
The slight
+87 C5
S°Co
47.2
48.6
50.8
52.2
5.2
5.2
5.5
5.7
185 oh
Total
9.1
8.6
8.0
8.5
Aa
61.5
62.4
64. 3
66.4
increase in the total cf the 187 as,
59.0
59.0
59.9
60.5
Sao.
and
+25 oh 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 con-
pensates 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 IN CLEARING EXPERIMENT
Area
Scaevola
Dedonea
Litter
Pounds of Aerial Portions
10 £t. radius
10 - 20 ft. radius
20 - 30 ft. radius
593
1717
33
112
59
364
5212
212
809
2902
Total
-
25
-
7
386