Indiana Administrative Code › Title 410 - INDIANA DEPARTMENT OF HEALTH › Article 5 - RADIOLOGICAL HEALTH › Rule 4 - Protection and Exposure Standards › Section 4-4 - Airborne radiation exposure; restricted areas

Current through July 10, 2024
Authority: IC 16-41-35-26; IC 16-41-35-29
Affected: IC 16-41-35
Sec. 4.
(a)
(1) No licensee or registrant 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,
				410
				IAC 5-4-27, Table I, Column
				1.2/3/4/ 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
				intake5/6/ 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,
				410
				IAC 5-4-27, Table I, Column 1.
(2) No licensee or registrant shall possess,
				use, or transfer mixtures of U-234, U-235, and U-238 in soluble form in such a
				manner as to permit any individual in a restricted area to inhale a quantity of
				such material in excess of the intake limits specified in Appendix A,
				410
				IAC 5-4-27, Table I, Column 1. If such soluble uranium
				is of a form such that absorption through the skin is likely, individual
				exposures to such material shall be controlled so that the uptake of such
				material by any organ from either inhalation or absorption or both routes of
				intake5/ does not exceed that which would result
				from inhaling such material at the limits specified in Appendix A,
				410
				IAC 5-4-27, Table I, Column 1 and footnote 5
				thereto.
(3) For purposes of
				determining compliance with the requirements of 410 IAC 5-4-4 the licensee or
				registrant shall use suitable measurements of concentrations of radioactive
				material in air for detecting and evaluating airborne radioactivity in
				restricted areas and in addition, as appropriate, shall use measurements of
				radioactivity in the body, measurements of radioactivity excreted from the body
				or any combination of such measurements as may be necessary for timely
				detection and assessment of individual intakes of radioactivity by exposed
				individuals. It is assumed that an individual inhales radioactive material at
				the airborne concentration in which he is present unless he uses respiratory
				protective equipment pursuant to 410 IAC 5-4-4(c). When assessment of a
				particular individual's intake of radioactive material is necessary, intakes
				less than those which would result from inhalation for 2 hours in any 1 day or
				for 10 hours in any 1 week at uniform concentrations specified in Appendix A,
				410
				IAC 5-4-27, Table I, Column 1 need not be included in
				such assessment, provided that for any assessment in excess of these amounts
				the entire amount is included.
2/ 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 in H-3 (S) in Appendix A,
				  410
				  IAC 5-4-27, Table I, Column 1 for 40 hours per week
				  for 13 weeks.
3/ For radon-222, the limiting
				  quantity is that inhaled in a period of one calendar year. For radioactive
				  material designated "Sub" in the "Isotope" column of the table, 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
				  410
				  IAC 5-4-2. These materials shall be subject to the
				  precautionary procedures required in 410 IAC 5-4-4(b)(1).
4/ Multiply the concentration
				  values specified in Appendix A,
				  410
				  IAC 5-4-27, Table I, Column 1 by 6.3 ×
				  108 milliliters to obtain the quarterly quantity
				  limit. Multiply the concentration value specified in Appendix A,
				  410
				  IAC 5-4-27, Table I, Column 1 by 2.5 ×
				  109 milliliters to obtain the annual quantity limit
				  for Rn-222.
5/ 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 410 IAC 5-4-4(a)(1) has been exceeded.
6/ Regulatory guidance on
				  assessment of individual intakes of radioactive material is given in U.S.
				  Nuclear Regulatory Commission 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,
				  U.S. Nuclear Regulatory Commission, Washington, D.C. 20555, upon written
				  request.