a) The licensee or registrant shall control
the occupational dose to individual adults, except for planned special
exposures pursuant to Section
340.260,
to the following dose limits:
1) An annual
limit, which is the more limiting of:
A) The
total effective dose equivalent being equal to 0.05 Sv (5 rem); or
B) The sum of the deep dose equivalent and
the committed dose equivalent to any individual organ or tissue other than the
lens of the eye being equal to 0.5 Sv (50 rem).
2) The annual limits to the lens of the eye,
to the skin and to the extremities which are:
A) A lens dose equivalent of 0.15 Sv (15
rem); and
B) A shallow dose
equivalent of 0.5 Sv (50 rem) to the skin or to any extremity.
b) Doses received in
excess of the annual limits, including doses received during accidents,
emergencies and planned special exposures, shall be subtracted from the limits
for planned special exposures that the individual may receive during the
current year and during the individual's lifetime (see Section
340.260(e)
) .
c) When the external exposure is determined
by measurement with an external personal monitoring device, the deep dose
equivalent shall be used in place of the effective dose equivalent unless the
effective dose equivalent is determined by a dosimetry method approved by the
Agency. The assigned deep dose equivalent shall be for the portion of the body
receiving the highest exposure. The assigned shallow dose equivalent shall be
the dose averaged over the contiguous 10 square centimeters of skin receiving
the highest dose.
AGENCY NOTE: The deep dose equivalent, lens dose equivalent
or shallow dose equivalent may be assessed from surveys or other radiation
measurements for the purpose of demonstrating compliance with the occupational
dose limits if the individual monitoring device was not in the region of
highest potential exposure or the results of individual monitoring are
unavailable.
d) The deep
dose equivalent, lens dose equivalent and shallow dose equivalent may be
assessed from surveys or other radiation measurements for the purpose of
demonstrating compliance with the occupational dose limits, if the individual
monitoring device was not in the region of highest potential exposure, or the
results of individual monitoring are unavailable.
e) Derived air concentration (DAC) and annual
limit on intake (ALI) values are specified in table 1 of appendix B to 10 CFR
20, published at 72 Fed. Reg.
55922, October 1, 2007, exclusive of subsequent
amendments or editions, and may be used to determine the individual's dose (see
Section
340.1160
) and to demonstrate compliance with the occupational dose limits.
f) Notwithstanding the annual dose limits,
the licensee shall limit the soluble uranium intake by an individual to 10
milligrams in a week in consideration of chemical toxicity (see footnote 3 of
appendix B to 10 CFR
20, published at 72 Fed. Reg.
55922, October 1, 2007,
exclusive of subsequent amendments or editions.)
g) The licensee or registrant shall reduce
the dose that an individual may be allowed to receive in the current year by
the amount of occupational dose received while employed by any other person
during the current year (see Section
340.250(a)
and (d)) .
