ARAP - The International Alligator Rivers Analogue Project: Background and Results

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Uranium orebodies contain a wide range of radionuclides and heavy metals of direct interest to waste repository design, including actinides, radium isotopes, lead isotopes and rare earth elements, as well as ultra-low levels of significant transuranic elements (239Pu, 237Np) and fission products (99Tc, 129I). Hence, they provide the opportunity for direct measurement of the migration of relevant radionuclides that has occurred over geological time and allow a reduction of uncertainties in the prediction of long-term transport of these radionuclides. The accessible timescales range from <1 year to about 500,000 or more years, depending on the process being studied. As uranium series elements are ubiquitous and can be measured at very low levels, there is also the possibility of transferring information from the analogue to any proposed repository site.