15-16
Gendex GXCB-500
TM
Service Manual
G990710 30 June 2008
Drywall Attenuation
The attenuation due to typical drywall found in offices was
measured. A simulated wall was constructed from two sheets of 5/8-
inch thick gypsum wallboard, spaced 4 inches apart, mounted on a
wood frame. The wall was placed between a scatter source (a head
phantom) and a Radcal Model 9010 Radiation monitor with 10X5 -
180 dosimeter chamber. The system was operated in a regular
scanning mode, and the radiation was measured with and without the
drywall. The results are below:
Therefore, the effect of a typical drywall or wallboard is to reduce
the X-ray radiation by about 40%. Please note that there may be
differences depending on the wall construction and composition,
and that this is an approximate guide only.
Measured Radiation mR
Distance from
Head
3 ft
(0.91m)
6 ft
(1.82m)
9 ft
(2.74m)
No Drywall
344.0 82.5 38.2
With Drywall
204.5 49.8 23.2
Transmission
59% 60% 61%
Attenuation
41% 40% 39%
Sensitivity Profile
Position Z-Axis mm
Sigma Width of Profile mm
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