Comparison of theoretical predictions and measured radon and radon daughter concentrations: toward validation of the UDAD code

The Uranium Dispersion and Dosimetry (UDAD) Code (Momeni, Yuan, and Zielen 1979) was developed to facilitate the prediction of potential radiation doses to individuals and populations in the vicinity of uranium processing facilities. The first step in these predictions is calculation of the airborne concentrations of radionuclides released during a routine industrial operation. In spite of efforts to provide flexibility for incorporating site-specific input values, the UDAD code prediction of airborne concentrations is subject to both theoretical and analytical uncertainties