G-Probe Previous Rounds
Reports for G-Probe rounds 1 and 2 were based on the format adopted for the GeoPT programme at that time, with tabulations of z-scores as a means of performance assessment.
In contrast, the legacy reports for round 5 onwards contain simple tabulations of the data reported by participating laboratories with multi-coloured diagrams showing the distribution of data by technique. They do not contain z-scores nor any other assessment of the quality of the data. Moreover, the “assigned values” do not have the same meaning as defined in the GeoPT protocol. For G-Probe these target values were obtained from one or two laboratories and are different from the median values of all participants.
From round 23 onwards, the operation of G-Probe has been harmonised with that of the GeoPT programme, with an online web interface for data reporting, the use of robust statistics to derive consensus values and individual z-scores issued. More details are available at www.gprobe.info
| Round | Year | Material | Epoxy colour | Identifier | Report Link |
|---|---|---|---|---|---|
| 1 | 2001 | basalt glass | – | TB-1G | GGR 26, 197-235 |
| 2 | 2004 | nephelinite glass | no colour | NKT-1G (GeoPT29) | GP-2 report |
| 3 | 2007 | diorite glass | – | – | no report |
| 4 | 2009 | synthetic CaCO3 | powder pellet | MACS-3 | no report |
| 5 | 2010 | basalt glass | – | BBM-1 | GP-5 report |
| 6 | 2010 | basalt glass | pink | BNV-1G (GeoPT16) | GP-6 report |
| 7 | 2011 | basalt glass (MORB) | no colour | BEND-1G | GP-7 report |
| 8 | 2011 | spiked soda lime glass | dark blue | SL-1G | GP-8 report |
| 9 | 2012 | andesite glass | – | AGV-2G | GP-9 report |
| 10 | 2012 | synthetic apatite | powder pellet | GP-MAPS | GP-10 report |
| 11 | 2013 | diabase glass | white | DVA-1G (W-2G) | GP-11 report |
| 12 | 2013 | gabbro glass | – | GSM-1G | GP-12 report |
| 13 | 2014 | diabase glass | light grey | GP-DB (DNC-1G) | GP-13 report |
| 14 | 2015 | basalt glass | greenish-yellow | BBRZ-1G (BRP-1G) (GeoPT25) | GP-14 report |
| 15 | 2015 | syenite glass | light purple | SyMP-1G (GeoPT39) | GP-15 report |
| 16 | 2016 | basalt glass (MORB) | no colour | BSWIR-1 | GP-16 report |
| 17 | 2016 | basalt glass | green-yellow | Gab-JPN (JGb-1) | GP-17 report |
| 18 | 2017 | dolerite glass | milky light green | TAZDol-1G | GP-18 report |
| 19 | 2017 | gabbro glass | light orange | OU-7G (GeoPT38) | GP-19 report |
| 20 | 2018 | spiked basalt glass (TE at ~50 ppm) | milky light blue | SynB-2G (GSD-2G) | GP-20 report |
| 21 | 2018 | spiked basalt glass (TE at ~500 ppm) | milky blue | SynB-3G (GSE-2G) | GP-21 report |
| 22 | 2019 | spiked basalt glass (TE at ~3-5 ppm) | milky white | SynB-1G (GSC-2G) | GP-22 report |
| 23 | 2020 | norite glass | purple | NoSM-1G | GP-23 report |
| 24 | 2021 | basanite glass | green plastic rod | BKWE-1G | GP-24 report |
Notes:
“Year” is the year the report was released. The epoxy mounts for most rounds were given a unique colour to aid identification. Where the powdered form of a material was also distributed as part of the GeoPT scheme the relevant round number is given. Where no information is available, this is indicated by “-“.