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VIII. Bioassays <br />1. Policy <br />Exposures to concentrations of airborne radioactive <br />materials will be maintained as far below regula- <br />tory limits as may be reasonably achievable. A <br />bioassay program will be implemented to assure that <br />controls are adequate for personnel protection, and <br />that exposures are being limited to the lowest ex- <br />tent practicable. <br />2. Program <br />The bioassay program will be comprised of three <br />segments, as defined in the following: <br />2.1 Preparatory Evaluations <br />A uranium urinalysis will be performed for <br />each individual prior to work assignment with- <br />in the confines of the restricted area. <br />Where feasible to do so (e.g., if facilities <br />can be made available without undue fiscal <br />constraint), in-vivo measurements will also <br />be made on each individual prior to work <br />assignment in the restricted area. Individuals <br />will not be permitted to begin work in the <br />restricted area unless, or until such time <br />that, retained organ or body burden are less <br />than 25% of the applicable maximum permissible <br />limit. i.e. <br />2.1.1 225 micrograms of natural uranium in <br />the kidneys (a uranium excretion rate <br />of 15 ~ g/1). <br />21 <br />