Table 1.

Si(Li)-EDS analysis of NIST Standard Reference Material 482 Copper–Gold Alloys^a (all concentration values in mass fraction)

Cu (certified)	Analyzed	Rel. error (%)	Au (certified)	Analyzed	Rel. error (%)	Total
0.198	0.198 ± 0.002	0.0	0.801	0.790 ± 0.002	−1.4	0.988
0.396	0.399 ± 0.001	0.8	0.603	0.594 ± 0.002	−1.6	0.993
0.599	0.605 ± 0.001	1.0	0.401	0.402 ± 0.002	0.1	1.007
0.798	0.797 ± 0.001	−0.1	0.200	0.199 ± 0.003	−1.2	0.996

Analysis performed with Cu Kα and AuLα; beam energy = 20 keV; quantitative calculations with NIST Desktop Spectrum Analyzer [12]; uncertainty expressed as 1σ from the measured counts (from Ref [13])

^aSee footnote 2