title: Determination and calibration of crystal lattice images of biological apatites.
abstract: Lattice imaging provides detailed information on the mineral phase of calcified tissues. The lattice space distances dhk1 depend directly on the accuracy of the magnification. Using synthetic apatite, K2PtCl6, graphitized C and crocidolite as calibration material the lattice parameters of human enamel have been determined. The relative errors in the mineral dhk1 values using crocidolite, K2PtCl6 and C are 0.6, 1.0 and 3.9 % resp. If hydroxyapatite is employed on the same grid as the enamel specimen, the d-values obtained are very close to the X-ray diffraction data; a reproducibility of 0.8% in a and c lattice parameter determination can be obtained on selected crystallites.
mesh_terms: D003461:Crystallography; D003743:Dental Enamel / Q000033:anatomy & histology*; D006801:Humans; D006882:Hydroxyapatites; D008854:Microscopy, Electron
chemical_list: D006882:Hydroxyapatites