| (a) The licensee shall control the occupational dose
to individual adults, except for planned special exposures under §336.310
of this title (relating to Planned Special Exposures), to the following
dose limits:
(1) an annual limit, which is the more limiting of:
(A) the total effective dose equivalent being equal
to 5 rems (0.05 sievert); 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 50 rems (0.5 sievert).
(2) the annual limits to the lens of the eye, to the
skin of the whole body, and to the skin of the extremities, which
are:
(A) a lens dose equivalent of 15 rems (0.15 sievert),
and
(B) a shallow-dose equivalent of 50 rems (0.5 sievert)
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 §336.310(5)(A)
and (B) of this title.
(c) 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 executive director. The assigned deep-dose equivalent must
be for the part of the body receiving the highest exposure. The assigned
shallow-dose equivalent must be the dose averaged over the contiguous
ten square centimeters of skin receiving 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 specified in Table I of §336.359,
Appendix B, of this title (relating to Appendix B. Annual Limits on
Intake (ALI) and Derived Air Concentrations (DAC) of Radionuclides
for Occupational Exposure; Effluent Concentrations; Concentrations
for Release to Sanitary Sewerage) and may be used to determine the
individual's dose and to demonstrate compliance with the occupational
dose limits. See §336.346 of this title (relating to Records
of Individual Monitoring Results).
(e) In addition to 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 note 3 of §336.359,
Appendix B, of this title.
(f) The licensee 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. See §336.309(e)
of this title (relating to Determination of Prior Occupational Dose).
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| Source Note: The provisions of this §336.305 adopted to be effective June 5, 1997, 22 TexReg 4588; amended to be effective August 30, 2001, 26 TexReg 6309; amended to be effective January 8, 2004, 29 TexReg 150; amended to be effective February 2, 2012, 37 TexReg 335 |
