. Bulletin. Science; Natural history; Natural history. ENERGY (KeV) a CO 3000 â O Rh (K°). Rh (K/3) ENERGY (KeV) b Fig. 2. Energy dispersive x-ray fluorescence "fingerprint" of Obsidian Butte volcanic glass, a) "fingerprint" of pressed powder sample OS-21 (see Table 4); b) "fingerprint" of unmodified obsidian flake sample OB-8 (see Table 2). and Ni are not measured well by non-destructive x-ray fluorescence, because concentrations for these elements in obsidians often fall below the minimum limits of detection (Vane 1977) at 200 seconds livet
. Bulletin. Science; Natural history; Natural history. ENERGY (KeV) a CO 3000 â O Rh (K°). Rh (K/3) ENERGY (KeV) b Fig. 2. Energy dispersive x-ray fluorescence "fingerprint" of Obsidian Butte volcanic glass, a) "fingerprint" of pressed powder sample OS-21 (see Table 4); b) "fingerprint" of unmodified obsidian flake sample OB-8 (see Table 2). and Ni are not measured well by non-destructive x-ray fluorescence, because concentrations for these elements in obsidians often fall below the minimum limits of detection (Vane 1977) at 200 seconds livetime. Computation of coeffi- cients of variation for sample means and standard deviations (Table 3) shows that these measurements vary widely across samples. Th, Nb, and Sr measure-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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