Nev. Admin. Code § 459.3255 - Compliance with requirements for summation of external and internal doses
1. If a licensee is required to monitor a
person pursuant to subsections 1 and 2 of NAC 459.339, the licensee shall
demonstrate compliance with the limits set forth in NAC 459.325 by adding
external and internal doses. The licensee may demonstrate compliance with the
requirements for summation of external and internal doses by meeting one of the
conditions specified in subsection 2 and the conditions specified in
subsections 3 and 4. The lens dose equivalent and the dose equivalents for the
skin and the extremities are not required to be included in the summation, but
are subject to separate limits set forth in NAC 459.325. If a licensee or
registrant is required to monitor a person pursuant to subsection 1 of NAC
459.339 only or pursuant to subsection 2 of NAC 459.339 only, the summation of
the doses is not required.
2. If
the only intake of radionuclides is by inhalation, the limit for the total
effective dose equivalent is not exceeded if the deep-dose equivalent divided
by the limit for the total effective dose equivalent, and one of the following,
does not exceed unity:
(a) The sum of the
fractions of the annual limit on intake by inhalation for each
radionuclide.
(b) The total number
of derived air concentration-hours for all radionuclides, divided by
2,000.
(c) The sum of the committed
effective dose equivalents to all significantly irradiated organs or tissues,
calculated from bioassay data using appropriate biological models and expressed
as a fraction of the annual limit. For the purposes of this subsection, an
organ or tissue shall be deemed to be irradiated significantly if, for that
organ or tissue, the product of the weighting factors and the committed dose
equivalent, per unit intake, is greater than 10 percent of the maximum weighted
value of the committed dose equivalent, per unit intake for any organ or
tissue.
3. If a person
who receives an occupational exposure also receives an intake of radionuclides
by oral ingestion in an amount greater than 10 percent of the applicable annual
limit on intake by oral ingestion, the licensee shall account for this intake
and include it in demonstrating compliance with the limits set forth in NAC
459.325.
4. Except as otherwise
provided in this subsection, the licensee shall evaluate and, to the extent
practical, account for the intake of radiation through wounds or absorption
through the skin. Any intake through intact skin is not required to be
evaluated or accounted for pursuant to this subsection.
Notes
NRS 459.030, 459.201
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