title: Evaluation of the time weighted average of air contaminants with special references to concentration fluctuation and biological half time.
abstract: Statistical parameters with carbon felt dosimetry are analyzed and new sampling criteria are presented based on the analysis. In cass where the mean of measured time-weighted averages is kept two times the unbiased standard deviation below the maximum permissible concentration-time weighted average (MPC-TWA) and the values above MPC-TWA are observed with a frequency of less than 5%, compliance is determined with a confidence limit of 95% provided the biological half time of the contaminant is longer than 4 hours.
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000395:Air Pollutants, Occupational / Q000032:analysis*; D001822:Body Burden; D006207:Half-Life; D008452:Maximum Allowable Concentration; D008962:Models, Theoretical; D013223:Statistics as Topic; D013997:Time Factors
chemical_list: D000393:Air Pollutants; D000395:Air Pollutants, Occupational