A COMPUTER-PROGRAM FOR SIMULATING THE PERFORMANCE OF THICK BED DIFFUSIVE SAMPLERS

This work has extended the capability of a computer model for estimating effective uptake rates of thick bed diffusive samplers (passive dosimeters), and has incorporated the calculation of ideal uptake rates and a theoretical model for predicting the effects of reverse diffusion. The program contains the following additional features: calculation of atmospheric concentrations according to the Dubinin-Radushkevich adsorption isotherm, calculation of diffusion coefficients, and estimation of reverse diffusion effects. No comparison of the results of these computer predictions to actual test data has yet been made. The calculations of uptake rates and atmospheric concentrations are based on either the Freundlich or the Dubinin-Radushkevich isotherm. Reverse diffusion is calculated according to either the Freundlich adsorption isotherm or a linear isotherm in combination with retention volumes. Any other isotherm or mathematical expression can easily be included in the program and used for calculating uptake rates, concentrations, and reverse diffusion effects.