The projection X-ray microscope ordinarily uses a transmission X-ray target. The spectrum generated in such a target depends on certain factors in the design and operation of the microscope. It is the intent to discuss in this paper the types of spectra obtained from transmission targets, and the proper selection of these for optimum results in the microscope. The spectral character of transmission targets is not the same as for reflection targets where the X-rays are viewed from the same surface upon which the electrons impinge For a sufficiently thick transmission target the intensity above the absorption edge of the target material is transformed by fluorescence to the characteristic wavelength. Conditions which change the amount of radiation so transformed will change the spectral character of the beam.
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