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|  DOE-HDBK-1130-98
Module 6: Radiological Access Controls and Postings
Instructor's Notes
3.
Contamination Areas (CAs)
CAs a re those areas, accessible to individuals, in
which removable contamination levels are greater
than 1 time but less than or equal to 100 times the
specified limits in Appendix D of 10 CFR 835.
a.
Posting Requirements:
"CAUTION, CONTAMINATION AREA"
b.
Unescorted entry into this area requires appropriate
training, such as RW II training.
4.
High Contamination Areas (HCAs)
An HCA is an area, accessible to individuals, in
which removable contamination levels are 100 times
or more the specified limits in Appendix D of 10
CFR 835.
a.
Posting Requirements:
"CAUTION or DANGER, HIGH CONTAMINATION
Show sign.
AREA"
Additionally, the posting may state:
"RWP REQUIRED FOR ENTRY"
b.
Unescorted entry into this area requires appropriate
training, such as RW II training.
5.
Airborne Radioactivity Areas (ARAs)
ARAs are those areas, accessible to individuals,
where the concentration of airborne radioactivity,
above natural background, exceeds or is likely to
exceed the specified limits in 10 CFR 835.
a.
Posting Requirements:
"CAUTION or DANGER AIRBORNE
RADIOACTIVITY AREA"
Additionally, the posting may state:
Show sign.
"RWP REQUIRED FOR ENTRY"
70
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