||Statistical evaluation of the TEM (Transmission Electron Microscopy) clearance procedure : draft report for Task 2-26 /
Chesson, Jean. ;
||Price Associates, Washington, DC.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.
||U.S. Environmental Protection Agency, Office of Research and Development, Risk Reduction Engineering Laboratory,
Asbestos--Environmental aspects ;
Asbestos fibers--Measurement ;
Transmission Electron Microscopy ;
School buildings ;
Building materials ;
United States.--Asbestos Hazard Emergency Response Act ;
Statistical analysis ;
Binomial density functions ;
Performance evaluation ;
Error analysis ;
Flow charts ;
Air pollution sampling ;
Indoor air pollution ;
Air pollution detection ;
Transmission electron microscopy
||Some EPA libraries have a fiche copy filed under the call number shown.
||45 p. : ill., 28 cm.
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. The main results of this evaluation of the proposed Transmission Electron Microscopy clearance procedure are: The 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/cu cm. Counting only fibers longer than 0.5 micrometers and with an aspect ratio of 5:1 or greater may increase or decrease decision error rates.
"July 1989." "Thomas J. Powers, Project Officer." Includes bibliographical references.