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G-Probe 25a and 25b reports are now available

Both the G-Probe 25a report for the phonolite glass, KPho-2G, and the G-Probe 25b report for the speleothem nano-pellet KCSp-1NP are now available for download.

Test materials for Round 26 of G-Probe involving both a glass and a pellet are expected to be dispatched in April for receipt in early May.


For enquiries about:

The test material and the G-Probe programme, contact Dieter Garbe-Schönberg: dieter.garbe-schoenberg@ifg.uni-kiel.de​

The delivery of test materials, contact Charles Gowing: cjbg@bgs.ac.uk

The website and reporting results online, contact Peter Webb: gprobe.iag@gmail.com

Payments and subscriptions, contact Chris Jackson: iag-treasurer@virginmedia.com


The G-Probe proficiency testing programme is provided by the International Association of Geoanalysts (IAG): www.geoanalyst.org/

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