Application of radioanalysis to the transport of micro-constituents by diffusion

Application of radioanalysis to the transport of micro-constituents by diffusion 1 first-author Laboratory for Analytical Chemistry, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands Laboratory for Analytical Chemistry, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands Predictions on the leaching behaviour of microconstituents from dumped, stored, or immobilised wastes are based on estimates of the effective diffusion coefficients involved, which usually range from ~10 -6 to ~10 -12 cm 2 •s -1 . Radioanalysis, especially radiotracer procedures, can be applied to determine these parameters on small (field) samples of granular material and test specimens of immobilised wastes. A summary of standard experiments for both types of material under non-steady state and steady state conditions is presented Radioanalysis Radiotracer Micro-constituents Diffusion coefficient References Crank J . The mathematics of diffusion , Oxford : Clarendon Press , 1975 The mathematics of diffusion Crank J . The mathematics of diffusion , Oxford : Clarenodn Press , 1975 , 212 The mathematics of diffusion Darken L S . Trans Am Inst Minmetall Engrs , 1984 , 175 : 184 Trans Am Inst Minmetall Engrs Das H A . Int J Appl Radiat Isot , 1993 , 44 : 1245 Int J Appl Radiat Isot Bowen H J M . Chemical applications of radioisotopes , London : Methuen Ltd , 1969 , Chapter 5 Chemical applications of radioisotopes Crank J . The mathematics of diffusion , Oxford : Clarenodn Press , 1975 , 251 The mathematics of diffusion Van der Sloot H A , de Groot G J , Steneker R L H et al . Int J Appl Radiat Isot , 1989 , 40 : 615 ~ 619 Int J Appl Radiat Isot Crank J . The mathematics of diffusion , Oxford : Clarenodn Press , 1975 , 41 The mathematics of diffusion Das H A . Stationary and self-forming liners around waste deposits. Formulation of release reduction and characterization by radiotracer experiments. Report of Department of Chemical Geology, Faculty of Earth Sciences , Utrecht University , The Netherlands , 1998 (Available upon request) Stationary and self-forming liners around waste deposits. Formulation of release reduction and characterization by radiotracer experiments. Report of Department of Chemical Geology, Faculty of Earth Sciences Das H A . Leaching tests on immobilised waste from monolithic bodies. Formulation, appraisal and use of radioanalysis. Report of Department of Chemical Geology , Faculty of Earth Sciences, Utrecht University , The Netherlands (Available upon request) Leaching tests on immobilised waste from monolithic bodies. Formulation, appraisal and use of radioanalysis. Report of Department of Chemical Geology Van Dalen A , Rijpkema J E . Modified sulphur cement. A low porosity encapsulation material for low, medium and alpha waste. Report EUR 12303 EN , 1989 Modified sulphur cement. A low porosity encapsulation material for low, medium and alpha waste. Report EUR 12303 EN O657.4, X591 1999-10-11 2000-08-01 2021-02-05 2000 Nuclear Science and Techniques 3 11