A REVIEW OF RESUSPENSION MODELS 21. Sehmel, G. A., and M. M. Orgill. 1974. "Resuspension Source Change at Rocky Flats." Pacifie Northwest Laboratory Annual Report for 1973: Atmospheric Sciences. BNWL-1850-3, Battelle, Pacific Northwest Labora— tories, Richland, WA 99352, pp. 212-214. 22. "Resuspension of Radioactivity 1975. Sehmel, G. A., and M. M. Orgill. Induced by Burning Crop Stubble." Pacific Northwest Laboratory Annual Report for 1974: Atmospheric Sciences. ABSTRACT "“Resuspension of Radioactive 1976. Sehmel, G. A., and M. M. Orgill. Isotopes Induced by Burning Forest Logging Slash." Pacifie Northwest Laboratory Annual Report for 1975: Atmospherte Setences. BNWL-2000- 3, Battelle, Pacific Northwest Laboratories, Richland, WA 99352. 24. Stewart, K. 1967. "The Resuspension of Particulate Material From Surfaces." In: Surface Contamination. B. R. Fish, Editor, Pergamon Press, New York. 25. Volchok, H. L., R. H. Knuth, and M. T. Klemman. 26. Wilson, R. H., R. G. Thomas, and J. N. Stannard. 1961. Biomedical and Aerosol Studies Associated With a Field Release of Plutonium, WT1511, Sandia Corporation, Albuquerque, NM. Fraction of Plutonium at Rocky Flats." Los Alamos Scientific Laboratory BNWL-1900-3, Battelle, Pacific Northwest Laboratories, Richland, WA 99352, pp. 223-225. 23. J. W. Healy 1972, "The Respirable Health Phys. 23(3):395-396. Resuspension is classified, according to the prominent path of exposure and the type of consideration involved in estimating concentrations, as general resuspension, local resuspension, and transfer resuspension, General resuspension can be driven by winds or mechanical disturbances while local resuspension and transfer resuspension are primarily caused by mechanical disturbances. Modeling techniques consist of the resuspension factor, the resuspension rate and mass-loading. For general resuspension the resuspension rate is preferred while the resuspension factor or mass-loading approach can be used for local resuspension. Data for estimation of transfer resuspension are not really adequate to even make a first approximation as to its importance. Resuspensfon of contaminants on the ground leading to inhalation is generally assumed to be an important pathway of exposure to people. Methods of calculation for prediction of this pathway (models) are used widely in Environmental Impact Statements, risk assessments, and derivation of standards. In recent years there has been a new surge of interest in thts pathway with many experiments and theoretical studies bringing us closer to an understanding of the phenomena involved and providing improved data for input to calculations. There is, however, much to be learned before reasonably accurate predictions for various areas of the country will allow us to eliminate the conservatism built into most predictions of resuspension. In the following material I discuss some of the basic concepts and calculational methods now in use. I have usually differentiated resuspension into two categories: general resuspension and local resuspension. General resuspension is that which results in concentrations over an area and, in which, the meteorological transport parameters play an important role. 211 210 This category can be