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High Spatial Resolution in X-Ray Fluorescence

  • John D. Zahrt (a1)

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During the past eight years or so there has been growing interest in using a polarized x-ray source in energy dispersive x-ray fluorescence spectrometers (1,2,3,4). The effect is to annihilate the source x rays before they scatter into the detector, thus significantly increasing the signal to noise ratio.

Both characteristic or Bremsstrahlung radiation can be polarized by 90° scattering from crystals (Bragg angle = 45°) or from amorphous materials respectively. This 90° polarizing scatter event greatly reduces the incident source radiation on a sample. In an effort to regain some intensity use is made of concave surfaces to utilize a manifold of beams (5,6,7).

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(1) Ryon, R., Adv. in X-Ray Anal., 20, 575590 (1977).
(2) Aiginger, H. and Wobrausehek, P., J. Radioanal. Chem., 61, 281293 (1981).
(3) Kirshke, P., Nuol. Inst. and Meth., A242, 566568 (1986).
(4) Ryon, R. and Zahrt, J., Adv. in X-Ray Anal., 22, 453460 (1979).
(5) Zahrt, J. and Ryon, R., Adv. in X-Ray Anal., 27, 505-511 (1984).
(6) Zahrt, J., Adv. in X-Ray Anal., 27, 513517 (1984).
(7) Wobrausehek, P. and Aiginger, H., X-Ray Spectrom., 12, 72-78 (1983).
(8) Johann, H., Zeit. f. Phys., 69, 185-206 (1931).
(9) Zahrt, J., Adv. in X-Ray Anal., 26, 331-336 (1983).
(10) Zahrt, J., Nucl. Inst, and Meth., A242, 558-562 (1986).
(11) Johanson, T., Zeit. f. Phys., 82, 507-528 (1933).
(12) Nichols, M. and Ryon, R., Adv. in X-Ray Anal., 29, 423-426 (1986).
(13) Zachariasen, W., “ Theory of X-Ray Diffraction in Crystals”, Dover Publications, NewYork, 1967.

High Spatial Resolution in X-Ray Fluorescence

  • John D. Zahrt (a1)

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