CLEARING EXPERIMENT EXPOSURE RATES
=tern
(ux/hr)
:s
Llation
Radius of
Cleared Area
insects
-
of the
Along
on
ore
:ruction
mM areas;
side
‘ high
leter
i@
area.
ntion
‘faces.
btained
aring
active
xternal
ptake
O'
10'
20'
30'
osure
nmarized
47.2
48.6
50.8
52.2
5.2
5.2
5.5
5.7
+#5 sb
Total
As
9.1
8.6
8.0
8.5
61.5 |
62.4
64.3
66,4
59.0
59.0
59.9
60.5
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 IN CLEARING EXPERIMENT|
Arga
Scaevola
Pounds
rometer
es-
5° Co
The slight increase in the total of the *°’Cs, S°co, and.
+“5sb 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
the
ola
oO ft.
dings
ny
*27Cs
10 ft.
of Aerial
radius
10 - 20 ft.
20 - 30 £t.
radius
radius
Total
Dodonea
Litter
Portions
593
33
59
1717
2902
112
67
364
386
5212
212
809
- 25 f°