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DOE-HDBK-1109-97
Radiological Safety Training for Radiation-Producing (X-Ray) Devices
Student's Guide
televisions, electron microscopes, high-voltage electron guns, electron beam welding
machines, electrostatic separators, and Jennings switches.
An intentional X-ray device is designed to generate an X-ray beam for a particular use.
Examples include X-ray diffraction and fluorescence analysis systems, flash X-ray
systems, medical X-ray machines, and industrial cabinet and noncabinet X-ray
equipment. Intentional X-ray devices are further divided into two subcategories:
analytical and industrial.
ANSI has issued two standards that provide radiation safety guidelines for X-ray systems.
ANSI N43.2 applies to non-medical X-ray systems and ANSI N43.3 applies to X-ray
diffraction and fluorescence systems.
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.
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