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    Question :
    What is different between secondary electron image and back scattered electron image?
    Category Physics Interview Questions
    Rating (0.4) By 1510 users
    Added on 8/28/2009
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    Answers:

    Secondary electron images show topography of a sample. Back scattered electron images show difference in composition - or more exactly, difference in atomic number over a sample.



    Backscattered electron images can be generated from samples with relatively smooth surfaces, as opposed to secondary electron image that rely on sample roughness to produce an image. Back scattered electrons are high-energy electrons that rebound from the sample surface. The quantity of electrons back scattered from a given surface is proportional to the mean atomic number (Z) of the sample



    Posted by: Barnali Maji    

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