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Now accepting results for G-Probe Round 25

The G-Probe 25 test materials for 2021 have been dispatched.

Note there will be only one round this year. Depending on your requirements, you should have received the phonolite glass, KPho-2G and / or the speleothem nano-pellet KCSp-1NP.

The Round 24 report for the basanite test material, BKWE-1G is available for download.


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/

The IAG gratefully acknowledges the major role that Steve Wilson (USGS) has played in initiating, organising and developing the G-Probe programme over many years.

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