The Nature of X-Rays

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IT is, of course, true that my letter (dated June 5) to which Dr. Barkla refers was written before I had had the opportunity of studying Dr. Barkla's latest results. A portion of my argument was based on his earlier work, and may need a little alteration in consequence. I have myself found by recent experiment that his older statements needed amendment. For example, the emergence and incidence secondary Röntgen radiations differ both in quality and quantity; the former is sometimes far greater than the latter.

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BRAGG, W. The Nature of X-Rays. Nature 78, 665 (1908) doi:10.1038/078665b0

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