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A comment on Germany and Italy pressed to bring $245B of gold home from US. Parent comment

Re:Germany and Italy pressed to bring $245B of gold home fro... by hoseja on Monday June 23, 2025 @08:27AM (#44355085)
Does XRF penetrate the sample? Isn't it a surface measurement?
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Re:Germany and Italy pressed to bring $245B of gold home fro... by signaturefish on Monday June 23, 2025 @10:02AM (#44355915)
XRF will go a millimetre or so into the sample AFAIK - it's mainly useful for finding alloy contamination, e.g. "this is 99.99% gold" vs "this is 73% gold and 27% other things" - you really want to use both techniques. Resistivity/conductivity is about average composition, XRF is about elemental purity.
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