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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
3.
Radiation leakage measured at
2 inches (5 cm) from any outer
surface must not exceed
0.25 mrem/hour during normal
operation.
(Add facility-specific examples.)
iii.
Open-Beam System.
According to ANSI N43.2, a device that
does not meet the enclosed-beam standards
is classified as an open-beam system. In an
open-beam system, one or more X-ray
beams are not enclosed, making exposure
of human body parts possible during
normal operation. The open-beam system
is acceptable for use only if an enclosed
beam is impractical because of any of the
following reasons:
1.
A need for frequent changes of
attachments and configurations.
2.
A need for making adjustments
with the X-ray beam energized.
3.
Motion of specimen and detector
over wide angular limits.
68
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