Administrative Rules of Montana › Department 37 - PUBLIC HEALTH AND HUMAN SERVICES › Chapter 37.14 - RADIATION CONTROL › Subchapter 37.14.7 - Standards for Protection Against Radiation › Rule 37.14.707 - PERMISSIBLE DOSES, LEVELS, AND CONCENTRATIONS: EXPOSURE OF INDIVIDUALS TO CONCENTRATIONS OF RADIOACTIVE MATERIAL IN AIR IN RESTRICTED AREAS

Current through Register Vol. 13, July 5, 2024
(1) No licensee shall possess, use, or
				transfer radioactive material in such a manner as to permit any individual in a
				restricted area to inhale a quantity of radioactive material in any period of 1
				calendar quarter greater than the quantity which would result from inhalation
				for 40 hours per week for 13 weeks at uniform concentrations of radioactive
				material in air specified in Appendix A, Table I, Column 1 of this subchapter.
				If the radioactive material is of such form that intake by absorption through
				the skin is likely, individual exposures to radioactive material shall be
				controlled so that the uptake of radioactive material by any organ from either
				inhalation or absorption or both routes of intake in any calendar quarter does
				not exceed that which would result from inhaling such radioactive material for
				40 hours per week for 13 weeks at uniform concentrations specified in Appendix
				A, Table I, Column 1 of this subchapter.
(a)
				Since the concentration specified for tritium oxide vapor assumes equal intakes
				by skin absorption and inhalation, the total intake permitted is twice that
				which would result from inhalation alone at the concentration specified for
				H-3(S) in Appendix A, Table I, Column 1 of this subchapter for 40 hours per
				week for 13 weeks.
(b) For
				radon-222, the limiting quantity is that inhaled in a period of 1 calendar
				year. For radioactive material designated "Sub" in the "Isotope" column of
				Appendix A, Table I of this subchapter, the concentration value specified is
				based upon exposure to the material as an external radiation source. Individual
				exposures to these materials may be accounted for as part of the limitation on
				individual dose in ARM
				37.14.705. These nuclides shall be
				subject to the precautionary procedures required by (4) (a) of this
				rule.
(c) Multiply the
				concentration values specified in Appendix A, Table I, Column 1 of this
				subchapter by 6.3 x 108 ml to obtain the quarterly
				quantity limit. Multiply the concentration value specified in Appendix A, Table
				I, Column 1 of this subchapter by 2.5 x 109 ml to
				obtain the annual quantity limit for Rn-222.
(d) Significant intake by ingestion or
				injection is presumed to occur only as a result of circumstances such as
				accident, inadvertence, poor procedure, or similar special conditions. Such
				intakes must be evaluated and accounted for by techniques and procedures as may
				be appropriate to the circumstances of the occurrence. Exposures so evaluated
				shall be included in determining whether the limitation on individual exposures
				in (1) has been exceeded.
(e)
				Regulatory guidance on assessment of individual intakes of radioactive material
				is given in Regulatory Guide 8.9, "Acceptable Concepts, Models, Equations and
				Assumptions for a Bioassay Program." Single copies of Regulatory Guide 8.9 are
				available from the Office of Standards Development, US Nuclear Regulatory
				Commission, Washington, DC 20555, upon written request.