Figure 9.

WDX measurements of a mouse specimen (post-eruptive enamel) and the two standards, CaF₂ and fluorapatite. White and red: post-eruptive outer enamel, 10 kV and 5 kV accelerating voltage, respectively. Green: CaF₂ standard, 20 kV accelerating voltage. Purple: fluorapatite standard, 20 kV accelerating voltage. Since the fluorine K_α1-peak is at 0.677 keV and the iron L_α1- and L_α2-peaks are at 0.705 and 0.718 keV, respectively, this measurement indicates reliably that iron was detected in murine incisors and not fluorine.