Model 3440 3–5
S
S
o
o
u
u
r
r
c
c
e
e
R
R
o
o
d
d
P
P
o
o
s
s
i
i
t
t
i
i
o
o
n
n
s
s
As shown in Figure 8, the source rod can be placed in the SAFE,
backscatter, or direct transmission positions. When not taking
measurements, keep the source rod in the SAFE position.
When measuring thin layer or other materials through which
you cannot drill a hole, use the backscatter position. In the
direct transmission positions, the source rod extends into a pre-
drilled hole.
BS
2"
50mm
3"
75mm
4"
100mm
5"
125mm
6"
150mm
7"
175mm
8"
200mm
9"
225mm
10"
250mm
11"
275mm
12"
300mm
Figure 8. Source Rod Positions
(Maximum Depth of 300 mm in Increments of 50 mm)
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