R 325.5208 Exposure of individuals to radioactive material in restricted areas.

Rule 208. (1) A licensee shall not receive, acquire, possess, use, or transfer radioactive material in such a manner as to cause an individual in a restricted area to be exposed to airborne radioactive material in an average concentration in excess of the limits specified in table I of appendix A in Rules 261 to 270. "Expose," as used in this rule, means that the individual is present in a region where an airborne concentration exist. An allowance shall not be made for the use of protective clothing or equipment, or particle size, except as authorized by the department pursuant to subrule (3) or (4) of this rule. (2) The limits given in table I of appendix A in Rules 261 to 270, are based upon an individual being exposed to the specified concentrations for the reference period of 40 hours in any 7 consecutive days. In any such period where an individual has been exposed for less than the 40 hours, the limits specified may be increased proportionately. In any such period where an individual has been exposed for more than 40 hours, the limits specified in the table shall be decreased proportionately. (3) The department may authorize a licensee to expose an individual in a restricted area to airborne concentrations in excess of the limits specified in table I of appendix A in Rules 261 to 270, upon receipt of an application demonstrating that the concentration is composed in whole or in part of particles of such size that the particles are not respirable and that the individual will not inhale the concentrations in excess of the limits established in the table. An application submitted pursuant to this subrule shall include an analysis of particle sizes in the concentrations and description of the methods used in determining the particle sizes. (4) The department may authorize a licensee to expose an individual in a restricted area to airborne concentrations in excess of the limits specified in table I of appendix A in Rules 261 to 270, upon receipt of an application demonstrating that the individual will wear appropriate protective equipment and that the individual will not inhale, ingest, or absorb quantities of radioactive material in excess of those which might otherwise be permitted under this part for individuals in restricted areas during a 40-hour week. An application submitted pursuant to this subrule shall contain all of the following information: (a) A description of the protective equipment to be employed, including the efficiency of the equipment for the material involved. (b) Procedures for the fitting, maintenance, and cleaning of the protective equipment. (c) Procedures governing the use of the protective equipment, including supervisory procedures and length of the time the equipment will be used by the individuals in each work week. The proposed periods for use of the equipment by any individual should not be of such duration as would discourage observance by the individual of the proposed procedures. (d) The average concentrations present in the areas occupied by individuals. (e) Procedures for bio-assay evaluation of the effectiveness of the proposed protective safeguards.