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Page Title:
Very High Radiation Areas (VHRs) |
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|  DOE-HDBK-1130-98
2. Very High Radiation Areas (VHRs)
A VHR is any area accessible to individuals in which radiation levels could result in an
individual receiving an absorbed dose in excess of 500 rad/hr at 1 meter from the
source of radiation.
a. Posting Requirements:
"GRAVE DANGER, VERY HIGH RADIATION AREA"
3. Contamination Areas (CAs)
CAs are 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 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:
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