X All Channels - Xfinit x Bb Take Test: Chapter 19 la b My Questions | bartleby x Digital Resources for Ch x Smartwork5 O sw5_25155_1.jpg (460x x х A sw5.wwnorton.com/problemsets/filemanager/userfiles/ctcox@stanford.edu/sw5_25155_1.jpg 100 90 (d) 70 60 50 (c) 40 (b) 20 10 (a) 3 4 8 Time (days) 3:18 PM O Type here to search 4/9/2020 Quantity of isotope (%)

X All Channels - Xfinit x Bb Take Test: Chapter 19 la b My Questions | bartleby x Digital Resources for Ch x Smartwork5 O sw5_25155_1.jpg (460x x х A sw5.wwnorton.com/problemsets/filemanager/userfiles/ctcox@stanford.edu/sw5_25155_1.jpg 100 90 (d) 70 60 50 (c) 40 (b) 20 10 (a) 3 4 8 Time (days) 3:18 PM O Type here to search 4/9/2020 Quantity of isotope (%)

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter27: Molecular Fluorescence Spectroscopy

Section: Chapter Questions

Problem 27.7QAP

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5.4.5 Chemical microanalysis5.4.5.1 Exploitation of characteristic X-raysElectron probe microanalysis (EPMA) of bulk samples is now a routine technique for obtaining rapid, accurate analysis of alloys. A small electron probe (100 nm diameter) is used to generate X-rays from a defined area of a polished specimen and the intensity of the various characteristic X-rays measured usingeither wavelength-dispersive spectrometers (WDS) or energy-dispersive spectrometers (EDS). Typically the accuracy of the analysis is š0.1%. One of the limitations of EPMA of bulk samples is that the volume of the sample which contributes to the X-ray signal is relatively independent of the size of theelectron probe, because high-angle elastic scattering of electrons within the sample generates X-rays. The consequence of this is that the spatial resolution of EPMA is no better than ¾2 µm. In the last few years EDX detectors have been interfaced totransmission electron microscopes which are capable of operating…
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