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|  DOE-HDBK-1109-97
Radiological Safety Training for Radiation-Producing (X-Ray) Devices
Student's Guide
is met if the shielding is at least equal to the thickness of lead specified in the following
table for the maximum rated anode current and potential.
MINIMUM SHIELDING TO KEEP THE DOSE RATE BELOW 0.25 MREM/HOUR
ANODE CURRENT
MILLIMETERS OF LEAD
(MA)
50 KVP
70 KVP
100 KVP
20
1.5
5.6
7.7
40
1.6
5.8
7.9
80
1.6
5.9
--
160
1.7
--
--
ii.
Industrial Systems.
Some industrial X-ray systems, such as the cabinet X-ray systems used for airport
security, are completely enclosed in an interlocked and shielded cabinet. Larger systems
such as medical X-ray units are enclosed in a shielded room to which access is
restricted. Shielding for X-ray rooms is conservatively designed to handle the expected
workload conditions. Radiological control technicians (RCTs) periodically verify that
the shielding integrity has not deteriorated.
X-Ray Device Control Office (or facility-specific equivalent) personnel develop
recommendations for shielding based on the following information:
1.
Shielding the primary X-ray beam and
2.
Shielding the areas not in the line of the primary beam from leakage and scattered
37
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