13. Accessible areas may be excepted from the radiological area posting requirements:
During transient radiological conditions of less than 8 continuous hours duration when posting is not practical,
such as radioactive material transfers. Under these conditions, the area shall be placed under the continuous
observation and control of individuals who are knowledgeable of and empowered to implement required
access and exposure control measures [see 835.604(a)]. These individuals should be stationed to provide line
of sight surveillance and verbal warnings.
When the area contains only packages of radioactive material received from transportation while awaiting
survey in accordance with Articles 552 and 554 [see 835.604(c)].
The exceptions discussed above apply only to radiological area and radioactive material area posting requirements
and do not apply to the entry control requirements established in 10 CFR 835.501 and 835.502.
232 Posting Controlled Areas
Controlled areas are established and posted to warn individuals that they are entering areas controlled for radiation
protection purposes. All radiological areas and radioactive material areas lie within the boundaries of controlled areas.
Individuals who enter only the controlled area without entering radiological areas or radioactive material areas are not
expected to receive a total effective dose equivalent exceeding 100 millirem in a year.
Each access point to a controlled area shall be posted whenever radiological areas or radioactive material areas
may be present in the area [see 835.602(a)].
The contractor may select the type of sign used to avoid conflict with local security requirements [see 835.602(b)].
This selection should be approved by the contractor senior site executive.
233 Posting Radiological Buffer Areas
Radiological buffer areas are intended to provide secondary boundaries within the controlled area to minimize the spread
of contamination and to limit doses to general employees who have not been trained as radiological workers.
A radiological buffer area should be established for contamination control adjacent to any entrance to or exit from a
contamination, high contamination, or airborne radioactivity area. The size of the radiological buffer area should be
commensurate with the potential for the spread of contamination.
A radiological buffer area should be established for exposure control adjacent to radiation, high radiation, and very
high radiation areas. The boundary for the radiological buffer area should be established to limit radiation doses to
general employees to less than 100 millirem per year.
A radiological buffer area is not required for:
High contamination or airborne radioactivity areas that are completely within contamination areas
Inactive contamination, high contamination, or airborne radioactivity areas (i.e., areas to which entry has been
prohibited by posting or barricades)
Exposure control, if other posted boundaries or controls provide equivalent employee protection
Exposure control, if general employees who are not trained as radiological workers are restricted from
unescorted entry to controlled areas.
The need for radiological buffer areas around radioactive material areas, soil contamination areas, and underground
radioactive material areas should be evaluated based upon the potential for exposure of unmonitored individuals
and the spread of contamination.