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DOE-STD-1128-98
Guide of Good Practices for Occupational Radiological Protection in Plutonium Facilities
3.2.2.4 Facility Posting and Labeling
Areas in plutonium facilities shall be posted in accordance with the requirements in
10 CFR 835 (DOE, 1998a). Implementation Guide G 441.1-10, Implementation
Guide. Posting and Labeling for Radiological Control (DOE, 1999d) provides
guidance to ensure compliance. The technical criteria and dose rate and/or levels
for defining radiation, high radiation, very high radiation, contamination, high
contamination, and airborne radioactivity areas are established in 10 CFR 835. The
health physics staff should identify:
--
Areas to be barricaded and marked to prevent personnel from inadvertently
entering them.
--
Areas to be physically controlled per 10 CFR 835, Subpart F.
Entrance to radiological areas shall be controlled (10 CFR 835.501(a and b))
commensurate with the existing and potential radiological hazard within the area.
The health physics staff should post current radiation surveys of radiation areas at
the health physics access control point for use in prejob planning. Airborne
Radioactivity Areas shall be posted with the words, "Caution, Airborne
Radioactivity Area" when the airborne radioactivity levels in the occupied area
exceed, or are likely to exceed, the DAC value listed in Appendix A or
Appendix C of 10 CFR 835 or where an individual could receive 12 DAC
hours in a week (10 CFR 835.603(d)). These areas are posted to alert personnel
of possible respiratory protection requirements.
3.2.2.5 Unposted Areas
Certain areas of facilities that handle radioactive materials should be maintained
free of detectable radioactive contamination. These areas should also be
maintained at ambient radiation levels equivalent to the environmental background
of the facility. Parts of the facility that should meet these requirements include
lunchrooms, offices, restrooms, janitor rooms, corridors outside operational areas,
foyers, and outside areas surrounding the facility, including the building roofs.
To assure these areas meet the requirements of radiological cleanliness, they should
be surveyed with count-rate instruments sensitive to the radioactive isotopes of
interest. In a plutonium facility, the instruments should meet the requirements
listed in ANSI Standard N317-1991, Performance Criteria for Instrumentation
3-9


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