^§ 835.602  Controlled areas.





 
§ 835.603  Radiological areas.

 


  Each access point to a radiological area (as defined in § 835.2) 
shall be posted with conspicuous signs bearing the wording provided 
in this section.
  (a) Radiation Area. The words ``Caution, Radiation Area'' 
shall be posted at any area accessible to individuals in which 
radiation levels could result in an individual receiving a deep 
dose equivalent in excess of 0.005 rem (0.05 millisievert) in 
1 hour at 30 centimeters from the source or from any surface 
that the radiation penetrates.
  (b) High Radiation Area. The words ``Danger, High Radiation 
Area'' shall be posted at any area accessible to individuals 
in which radiation levels could result in an individual receiving 
a deep dose equivalent in excess of 0.1 rem (0.001 sievert) 
in 1 hour at 30 centimeters from the radiation source or from 
any surface that the radiation penetrates.
  (c) Very High Radiation Area. The words ``Grave Danger, Very 
High Radiation Area'' shall be posted at any area accessible 
to individuals in which radiation levels could result in an 
individual receiving an absorbed dose in excess of 500 rads 
(5 grays) in one hour at 1 meter from the radiation source or 
from any surface that the radiation penetrates.
  (d) Airborne Radioactivity Area. The words ``Caution, Airborne 
Radioactivity Area'' shall be posted for any occupied area in 
which airborne radioactivity levels exceed, or are likely to 
exceed, 10 percent of the DAC value listed in appendix A or 
appendix C of this part.
  (e) Contamination Area. The words ``Caution, Contamination 
Area'' shall be posted where contamination levels exceed values 
listed in appendix D of this part, but are less than or equal 
to 100 times those values.
  (f) High Contamination Area. The words ``Danger, High Contamination 
Area'' shall be posted where contamination levels are greater 
than 100 times the values listed in appendix D of this part.




vSubpart H-Records