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|  DOE-HDBK-1130-98
Module 9: Radioactive Contamination Control
Instructor's Notes
2.
Very High Radiation Area
A Very High Radiation Area is any area, accessible
to individuals, in which radiation levels could result 1m is slightly more than 1
in an individual receiving an absorbed dose in excess yard (39.37 inches)
of 500 rads in one hour at 1 meter from a radiation
source or from any surface that the radiation
penetrates.
B.
Signs and Postings
1.
High Radiation Area
High Radiation Areas will be posted with a standard
radiation symbol colored magenta (or black) on a
yellow background, reading:
Show sign.
"CAUTION"
or
"DANGER
HIGH RADIATION AREA"
Additionally the posting may state:
"Personnel Dosimeter, Supplemental Dosimeters,
and RWP Required for Entry"
2.
Very High Radiation Area
Very High Radiation Areas will be posted with a
standard radiation symbol colored magenta (or
black) on a yellow background, reading:
Show sign.
"GRAVE DANGER,
VERY HIGH RADIATION AREA"
Additionally the posting may state:
EO2 Identify sources and
locations that may produce
"Special Controls Required for Entry"
High Radiation Areas and
Very High Radiation Areas.
Some HRAs and VHRAs only exist when
machinery is energized, such as radiation producing
devices. For example, a posting could be:
"High Radiation Area When Warning Light is On"
"Controlled Area When Warning Light is Off"
79
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