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2.1.2 4.0 nanocuries of thoracic natural <br />uranium. <br />2.1.3 25 nanocuries of 226-Radium in the <br />whole body. <br />2.2 Exposure Control Evaluations <br />Routine bioassays will be made to assure that <br />significant levels of exposures and gradual <br />buildups in organ or body burdens do not go <br />undetected. The routine program will be con- <br />ducted in accordance with the conditions speci- <br />fied in the US Nuclear Regulatory Commission's <br />Regulatory Guide Number 8.22, entitled "Bio- <br />assay At Uranium Mills" (as currently ammended). <br />2.3 Diagnostic Evaluations <br />A diagnostic evaluation will be made at any time <br />there is reason to suspect that an overexposure <br />has occurred (i.e., excessive bioassay results, <br />etc.) Typical diagnostic evaluation steps may <br />include: <br />2.3.1 Removal from the potential for further <br />exposure. <br />2.3.2 Intensive urine sampling, or, if <br />warranted, repetitive in-vivo measure- <br />ments, to determine the magnitude of the <br />initial deposition. <br />2.3.3 Investigative air sampling in the in- <br />dividual's known work areas. <br />2.3.4 Performing bioassays on the individual's <br />co-workers to determine if others may <br />have been exposed. <br />22 <br />