(a) No employer shall possess, use or transport radioactive material
in such a manner as to cause any employee, within a restricted area, to
be exposed to airborne radioactive material in an average concentration
in excess of the limits specified in Table I of Appendix B to 10 CFR
Part 20. The limits given in Table I are for exposure to the
concentrations specified for 40 hours in any workweek of 7 consecutive
days. In any such period where the number of hours of exposure is less
than 40, the limits specified in the table may be increased
proportionately. In any such period where the number of hours of
exposure is greater than 40, the limits specified in the table shall be
decreased proportionately.
(b) No employer shall possess, use, or transfer radioactive material
in such a manner as to cause any individual within a restricted area,
who is under 18 years of age to be exposed to airborne radioactive
material in an average concentration in excess of the limits specified
in Table II of Appendix B to 10 CFR Part 20. For purposes of this
paragraph, concentrations may be averaged over periods not greater than
1 week.
(c) Exposed as used in this section means that the individual is
present in an airborne concentration. No allowance shall be made for the
use of protective clothing or equipment, or particle size, except as
authorized by the Director, Bureau of Labor Standards.
