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DOE-HDBK-1106-97
Lesson Plan
Instructor's Notes
Reference: 10 CFR 835.2(a)
3. High Contamination Area
Any area where removable contamination levels are
greater than 100 times the values listed in Appendix D of
10 CFR 835.
The posting/sign will indicate:
"DANGER, HIGH CONTAMINATION
AREA Radiological Work Permit (RWP)
Required for Entry."
4. Airborne Radioactivity Area
Any area where the measured concentration of airborne
Reference: 10 CFR 835.2(a)
radioactivity, above natural background, exceeds or is
and 835.603(d)
likely to exceed the derived air concentration (DAC)
values listed in Appendix A or Appendix C of 10 CFR
835 or where an individual in the area without
respiratory protection could receive an intake exceeding
12 DAC-hours in a week.
The posting/sign will indicate:
"CAUTION, AIRBORNE RADIOACTIVITY
AREA"
A DAC is the radionuclide airborne concentration.
Breathing an air concentration of 1 DAC for 1 working
year (2,000 hours) will result in committed dose
equivalent equal to an annual limit, i.e., 5 rem whole
body or 50 rem to any organ or tissue.
25


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