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(2020) An X-Ray Spectrometry Method for Estimating Diffusion and Ion-Exchange Properties of Rocks

Morfin S, Hafezian G, Kumahor S & Al T


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08b: Room 3, View in program

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Laura Kennell-Morrison on
In the context of the selected tracers, are there any limitations associated with sample mineralogy (i.e., are there special considerations on the tracer used with respect to the rock type/composition of the samples under investigation)? Based on the presentation, the rotation speed would be adjusted based on the core diameter/sample size in order to capture the full sample, over 360 degrees, in a given time interval, correct (i.e., it would require adjustment for different sample sizes to ensure full coverage and to eliminate the beam hardening artefacts; is that correct)?
Yes, one important consideration is the compatibility of the tracer with the rock composition. For example, we commonly choose iodide as our tracer because it has a relatively high X-ray attenuation coefficient, and in most cases we assume it is a conservative tracer. However, iodide sometimes behaves in a non-conservative manner in rocks that have elevated organic carbon content. The number of rotations is not critical as long as it is more than 1. The number of rotations is dictated by the acquisition time, which is optimized for total counts vs total acquisition time. Eliminating the beam hardening effect is achieved by selecting narrow energy ranges.

Submitted by Arjen van Veelen on
Is this based on synchrotron or lab-based CT? What type of tracer are you using? Niopam?

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