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|  Radiological Assessor Training
DOE-HDBK-1141-2001
Instructor's Guide
B. Shielded installation
The RGD and all objects exposed to the source
are within a permanent enclosure from which
persons are excluded during the irradiation.
Some of the requirements for shielded
installations include mandatory interlocks,
audible and visual warning devices, a "crash"
button, and posting of warning signs.
Skyshine is the term used to describe radiation
emerging more or less vertically from a shielded
enclosure, which then scatters from air
molecules to produce radiation at some distance
from the source.
C. Unattended installation
The RGD is installed in a single-purpose
shielded enclosure, and the design shall ensure
that individuals are not exposed to doses
exceeding 100 mrem in a year.
D. Open installation
Open installations must be conspicuously
posted, and have a conspicuously defined
perimeter. The perimeter must delimit the area
in which the exposure can exceed 5 mrem in
any one hour. The operational staff shall
provide constant surveillance. Other
requirements include use of survey meters,
personnel dosimetry, and temporary shielding.
Summarize lesson.
Review objectives.
Ask for questions.
Module 12 12
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