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Natural Tracer Profiles Across Argillaceous Formations

The CLAYTRAC Project

image of Natural Tracer Profiles Across Argillaceous Formations

This technical report describes the results of the Nuclear Energy Agency's CLAYTRAC project, in which natural tracer data from nine sites was evaluated to assess potential impacts of disposal of radiological waste in geological repositories. It shows scientific information from numerous sites and applies robust analytical methods to improve the understanding of radionuclide migration and evolution of sites for deep geological disposal. These results improve the understanding of sites, and thus the confidence in safety, for geological disposal of radioactive waste.

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Appendix A2

Experimental Techniques and Analytical Methods to Characterise Tracer Contents in Argillaceous Formations

Nuclear Energy Agency

The mass of pore water present in an argillaceous rock formation is significant and varies between a few % to several tens of % depending on the geologic history of the formation. Due to the low permeability of argillaceous formations, pore water cannot be sampled by conventional groundwater sampling techniques. Thus, information about tracer concentrations in pore water can only be obtained by applying indirect extraction techniques based on fresh, saturated rock material, or directly by long-term and cost-intensive in-situ experiments in underground facilities. Indirect techniques are described in Sections A2.4 to A2.9, and direct techniques follow in Section A2.10. 

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