Hi Tbone, can't help you with the "fd" reading but the numbers...

Hi Tbone, can't help you with the "fd" reading but the numbers look good remember though pXRF readings are really just a guide for sample composition. Results of pXRF readings are easily affected by water content, soil organic matter content, soil particle size, and other factors. Having said that the Rock Doctors have their own "in house" methodology for pXRF analysis which I'm sure is compliant with all relevant standards. Just like providing data from rock chips pXRF data results tend to be higher than the more accurate laboratory assay results.

Check out this presentation on the use of XRF equipment from Olympus which by the way is the brand of instrument WMG are using. Very informative and good weekend viewing for those interested in these things.