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Investigation of the Various Factors Affecting the Response of Passive Configuration Track Etch Dosimeters to Working Level Hour Exposure in Radon and Radon Daughter Atmospheres.
NTIS: PB/266-768 Available for Reference At Bureau Libraries :167 pages
The work described in this report was directed toward identifying and devising methods to minimize the previously observed variability between working level hour exposures and the alpha particle track densities resulting on track etch films exposed to mine atmospheres containing radon and radon daughters. The disequilibrium between radon and its daughters was shown to directly affect the track etch film calibration factor. A nonlinear, iterative regression analysis was formulated that successfully predicted working levels to within 8 to 10 pct from only the alpha particle activities (rn, raa, and rac') data such as are obtainable from track etch films over a wide range of disequilibrium conditions. A model expressing atmospheric concentrations as a function of radon source strength, plate-out rate factor, ventilation rate, and the fractional reentry by recoil of previously plated-out daughters was derived.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/266-768 Available for Reference At Bureau Libraries
General Electric Company
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division