Heidelberg 2006 – wissenschaftliches Programm
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ST: Strahlen- und Medizinphysik
ST 14: Medizinphysikalische Messverfahren
ST 14.3: Vortrag
Mittwoch, 15. März 2006, 13:00–13:10, D
Radiation techniques for the study of bones, teeth and kidney stones — •Anwar Chaudhri1, Nasir Chaudhri2, and John Watling3 — 1Inst. of Medical Physics, Klinikum-Nuernberg & PCSIR, Lahore, Pakistan — 2Pakistan Council of Scientific & Industrial Research, Lahore, Pakistan — 3Centre for Forensic Science, Uni. of Western Australia
Various nuclear activation techniques have been developed and applied to determine the elemental composition of calcified tissues (teeth and bones). Fluorine was determined by prompt gamma activation analysis through the 19F(p,ag)16O reaction. Carbon was measured by activation analysis with He-3 ions, and the technique of Proton-Induced X-ray Emission (PIXE) was applied to simultaneously determine Ca, P, and trace elements in well-documented teeth. Dental hard tissues: enamel, dentine, cementum, and their junctions, as well as different parts of the same tissue, were examined separately. Furthermore, using a Proton Microprobe, we measured the surface distribution of F and other elements on and around carious lesions on the enamel. The depth profiles of F, and other elements, were also measured right up to the amelodentin junction. Some results on qualitative trace elements analysis of teeth and on the distributions of various elements in kidney stones, using the powerful technique of Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry (La-ICP-MS) are also presented.