A complete, historical dataset is presented of radionuclide resuspension-factors. These data span six orders of magnitude in time (ranging from 0.1 to 73,000 d), encompass more than 300 individual values, and combine observations from events on three continents. These data were then used to derive improved, empirical models that can be used to predict resuspension of trace materials after their deposit on the ground. Data-fitting techniques were used to derive models of various types and an estimate of uncertainty in model prediction. Two models were found to be suitable: a power law and the modified Anspaugh et al. model, which is a double exponential. Though statistically the power-law model provides the best metrics of fit, the modified Anspaugh model is deemed the more appropriate due to its better fit to data at early times and its ease of implementation in terms of closed analytical integrals.
* Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401; † Division of Radiobiology, Department of Radiology, University of Utah, Salt Lake City, UT 84108.
This project was funded by the Department of Energy's Technology Integration Program though Sandia National Laboratories (SNL).
For correspondence contact: Reed Maxwell, Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401, or email at firstname.lastname@example.org.
(Manuscript accepted 4 April 2011)