QSA Global, Inc.
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Operations Manual
MAN-067
March 2023
Page 18 of 32
Backscatter Radiation Levels
Survey
Point
Without Backscatter Shield
mR/Hr (µSv/hr)
With Backscatter Shield
in mR/Hr (µSv/hr)
A
1 (10)
1(10)
B
14 (140)
14 (140)
C
15 (150)
6 (60)
D
1 (10)
0 (0)
E
11 (110)
2 (20)
F
12 (120)
7 (70)
G
1 (10)
1 (10)
H
4 (40)
≤BKGD
I
≤BKGD
≤BKGD
J
2 (20)
≤BKGD
K
≤BKGD
≤BKGD
Figure 11 Example Scatter Radiation Survey
Figure 11 shows an example survey of backscatter radiation (user exposure) for a typical sample (
NOTICE:
for reference
only; actual readings may vary). The example survey shown in Figure 11 was created with the following conditions:
6 in steel pipe
2 in calcium silicate insulation
.040 in [1 mm] thick aluminum cladding
70 kV @ 0.17 mA (maximum power at the highest kV level)
See the following section for additional information on backscatter.
