Lecture_overheads_-_XRF (5)

Lecture_overheads_-_XRF (5) - INTRODUCTION TO X-RAY...

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Note that these materials were specifically designed for undergraduate chemistry and biochemistry majors but are also appropriate for novices to the field of XRF Dr. Pete Palmer Professor San Francisco State University Science Advisor San Francisco District Laboratory Food and Drug Administration INTRODUCTION TO X-RAY FLUORESCENCE (XRF) Theory, Spectral Interpretation, & Use for Various Elemental Analysis Applications
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FDA & its San Francisco District Laboratory for funding, collaborations, and funding for and access to a variety of XRF instrumentation Richard Jacobs (Toxic Element Specialist) Sally Yee (Chemistry Supervisor) Tom Sidebottom and Rod Asmundson (Lab Directors) George Salem, Carl Sciaccitano, and Selen Stromgren (DFS) XRF vendors for freely providing their knowledge and expertise as well as the loan of several XRF analyzers to San Francisco State University Bruker (Bruce Kaiser, Alexander Seyfarth) Innov-X (Jack Hanson, Kim Russell, Innov-X University Equipment grant) Thermo/Niton (Rich Phillips, Peter Greenland) Dr. Palmer would like to extend a special thanks to the several generations of San Francisco State University students , who acquired XRF data, participated in the research and development of various XRF methods, and were intimately involved in numerous XRF case studies ACKNOWLEDGEMENTS
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http://www.xkcd.com/ The CSI Syndrome: The growing popularity of forensic sciences as evidenced by TV series on this subject has attracted many young people to this discipline Unfortunately, these shows often trivialize the science and rigor needed to derive reliable results on “real world” samples Science does not always give yes/no answers (and real world problems are usually not solved in a 60-minute episode) Forensic science requires careful work and is a lot harder than it looks on TV Nothing is more useless than an powerful tool that is not used properly (plenty of examples with XRF)
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OUTLINE 1. INTRODUCTION What is XRF and what are its typical uses? Electromagnetic spectrum and X-rays Basic theory of XRF Simple XRF spectra Different types of XRF instruments 2. INTERPRETATION OF XRF SPECTRA XRF spectra of different elements Limited resolution and overlapping peaks Artifact peaks (from X-ray tube source, detector, blank media) Qualitative analysis (what elements are in the sample?) Quantitative analysis (how to compute concentrations?) 3. CONCLUSIONS Example XRF applications XRF advantages and limitations Safety information
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WHAT IS XRF? a. X-ray Fluorescence Spectrometry b. An elemental analysis technique c. Another acronym to remember d. A new scientific gadget to play with e. The closest thing we have to a tricorder f. An advanced, highly automated, portable analytical tool that can be used by field investigators to support their job functions g. All of the above
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TYPICAL APPLICATIONS OF XRF XRF is currently used in many different disciplines: Geology Precious metal identification
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Lecture_overheads_-_XRF (5) - INTRODUCTION TO X-RAY...

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