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|  DOE-HDBK-1109-97
Radiological Safety Training for Radiation-Producing (X-Ray) Devices
Instructor's Guide
Lesson Plan
Instructor's Notes
C.
INCIDENTAL X-RAY DEVICES
i.
Exempt Shielded Systems.
Exempt shielded systems are defined in the
ANSI Standard N43.3. Electron
microscopes and other systems that are
exempt shielded are inherently safe, and
require review only on purchase or
modification. The exposure rate during any
phase of operation of these devices at the
maximum-rated continuous beam current
for the maximum-rated accelerating
potential should not exceed 0.5 mrem/hour
at 2 inches (5 cm) from any accessible
external surface.
(Add facility-specific examples.)
ii.
Other Devices.
At a research laboratory, many devices
produce incidental X-rays. Any device that
combines high voltage and a vacuum could,
in principle, produce X-rays. For example,
a television or computer monitor generates
incidental X-rays, but in modern designs
the intensity is small, much less than 0.5
mrem/hour.
Occasionally, this hazard is recognized
only after the device has operated for some
time.
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