Evaluation of positron-emission-tomography for visualisation of migration processes in geomaterials

摘要: Abstract Positron-emission-tomography (PET) was applied for direct visualisation of solute transport in order to overcome the limitations conventional methods measuring advection and diffusion properties. At intervals from minutes days 3D-spatial distribution PET-tracer is determined. This spatiotemporal evolution tracer concentration can be used as experimental basis clarification relevant processes, derivation parameters, model calibration. Here, 18 F 124 I 0.01 M carrier solution KF KI, respectively, have been chosen out limited number available PET-tracers, primarily on account their decay time span experiments. The sample a granite core Aspo Hard Rock Laboratory which carries an axial fracture with aperture ∼0.5 mm. Therefore, its permeability high: high injection rates 0.1 ml/min caused pressure drop below 100 kPa. experiments showed that path through modulated by flow rate. comparison different indicates into matrix material at localized sites. However, derived length falls resolution limits medical PET-scanner. With recently dedicated high-resolution PET-scanners, are usually biomedical research, effects will clearly resolvable.