Current through Register Vol. 30, No. 38, September 20, 2024
A. Each licensee or registrant shall control
the occupational dose to individual adults, except for planned special
exposures required in
R9-7-413, 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 of the whole body or to the skin of
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
R9-7-413.
C. The assigned deep-dose equivalent and
shallow-dose equivalent are, for the portion of the body receiving the highest
exposure, determined as follows:
1. 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.
2. If a protective apron is worn and
monitoring is conducted as specified in
R9-7-419(B), the
effective dose equivalent for external radiation shall be determined as
follows:
a. If only one individual monitoring
device is used and it is located at the neck outside the protective apron, and
the reported dose exceeds 25% of the limit specified in subsection (A), the
reported deep-dose equivalent value multiplied by 0.3 is the effective dose
equivalent for external radiation; or
b. When individual monitoring devices are
worn, both under the protective apron at the waist and outside the protective
apron at the neck, the effective dose equivalent for external radiation is
assigned the value of the sum of the deep-dose equivalent reported for the
individual monitoring device located at the waist under the protective apron
multiplied by 1.5 and the deep-dose equivalent reported for the individual
monitoring device located at the neck outside the protective apron multiplied
by 0.04.
3. When the
external exposure is determined by measurement with an external personal
monitoring device, the deep-dose equivalent must be used in place of the
effective dose equivalent, unless the effective dose equivalent is determined
by a dosimetry method approved by the Department. The assigned deep-dose
equivalent shall be determined for the part of the body that receives the
highest exposure. The assigned shallow-dose equivalent is the dose averaged
over the contiguous 10 square centimeters of skin that receives the highest
exposure. 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.
D. Derived air concentration (DAC)
and annual limit on intake (ALI) values are presented in Table I of Appendix B
and may be used to determine the individual's dose and to demonstrate
compliance with the occupational dose limits.
E. 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.
F. The licensee or
registrant shall reduce the dose that an individual may receive in the current
year by the amount of occupational dose received while employed occupationally
as a radiation worker by all previous employers. See
R9-7-412.
