Something I learned about hand held XRF from information left on my assay below. which may explain why NobleMetalWorks is getting poor results from who ever the operator is.
Research tells me the majority of hand held XRF's on the market have a beam voltage from 45 to 50 kv, the part of my assay below that sparked my curiosity is below Sample 1 where it say Balance 949.3k this number represent the beam voltage used to shot my sample, As the operator increased the beam voltage for the second shot you'll now notice on some elements the PPM have risen while others learning more towards precious have fallen off slightly. Unfortunately we do not have the beam voltage used on sample three but once again we see the varied results.
The folks that shot these samples obviously own a high end XRF with the high bean voltages giving the gun precious metals capabilities, Scott I would suggest that you ask the people shooting your samples how much beam power the gun has and get the beam voltages used as part of the assay. Also how often the gun is recalibrated and if the person if the person performing the calibration is certified.
After researching beam voltages I now know why they charged my as much as they did for the assay, that high voltage xray tube must cost a small fortune to replace.
The sample I provided was first oven dried then ball milled once removed from the mill the sample rolled in every direction assuring a homogeneous mixture before being quartered then from the quarters three were pressed into compact prills. The fourth quarter would under normal lab practices be filed as referee,
You can not obtain a proper XRF reading from a powder it has to be pressed into a compact button using a hydraulic press.
The C-con yard in Abbotsford only have two people certified to operate the XRF,
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