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STATISTICAL EVALUATIONOF THE PERFORMANCE OF THE TEM CLEARANCE PROCEDURE
Citation:
Chesson, J. AND J. Rosenberg. STATISTICAL EVALUATIONOF THE PERFORMANCE OF THE TEM CLEARANCE PROCEDURE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-89/044.
Description:
EPA has evaluated the performance characteristics of the three-step clearance procedure under a variety of conditions with the use of a negative binomial distribution to describe the statistical distribution of asbestos fiber concentrations and the Z-test to perform the inside/outside comparisons. he main results of this evaluation of the proposed TEM clearance procedure are: he false negative error rates are lower when the underlying statistical distribution of airborne asbestos concentrations follows a lognormal distribution; of the four inside/outside comparison tests; the Poisson test has the lowest false negative error rates, but also has the highest false positive rates; sampling the minimum volume of air increases the false negative error rate, particularly at airborne asbestos concentrations less than 0.06 f/cm3; and counting only fibers longer than 0.Sum and with an aspect ratio of 5:1 or greater may increase or decrease decision error rates.