Kavo 3D eXam ® Operators’ Manual
K990400 16 April 2008
12-8
Drywall Attenuation
The attenuation properties of drywall were studied. A drywall
consisting of two 4 feet x 8 feet x 5/8 inch [1.2m x 2.4m x 1.6 cm]
sheets were attached to either side of a 2 feet x 4 feet [.6m x 1.2m]
board. The wall was placed 51 inches [1.3m] from the center of the
scatter phantom. Using a calibrated Radcal Model 9010 Radiation
monitor, with 10 x 5-180 chamber, the exposure was measured as 28
uR. The ion chamber was placed 12 inches [.3m] from the wall and
67.5 inches [1.7m] from the midline of the scatter phantom. Without
the drywall the exposure was 56 uR. The drywall affords a 50%
transmission factor or one half-value layer.
Recommended Operating Requirements
Local agencies or government bodies or international standards may
dictate different and/or additional requirements for installation of
the system in order to protect personnel and the public from
exposure from the radiological output of the device. Consult your
local agencies, government bodies, or international standards for
actual requirements which apply.
It is recommended that a qualified Physicist or Radiologist
determine where appropriate, the applicable lead shielding to be
installed in the area around the system equipment. The minimum
lead thickness required is 0.8 mm [1/32 in] lead. Thicker lead can be
used if desired. Below are highlights of some other common
requirements that may apply to your location:
• The Computer Workstation and X-ray Operator should be
located at a minimum of two meters or behind a properly
shielded permanent barrier. A viewing window (or
alternative method such as a mounted mirror) should be
present to enable the X-ray Operator to view the Patient and
operate the computer while the exposure is present.
• The Operator Control Box and Acquisition Computer shall
be located within 1 meter [3.28 ft] from door. If not, an
interlocked door may be required.
• A room door may be required.
• Radiation warning signs may be required next to the
entrance to the room.
• A Warning light may be required by the entrance to the
room.
• A shielding plan should be performed where the system is
being installed. Some local agencies or government bodies
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