High Contamination Area - doe-hdbk-1106-97

DOE-HDBK-1106-97

Lesson Plan

Instructor's Notes

Reference: 10 CFR 835.2(a)

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.