The energy-dependent behavior of noise Wiener spectra in their low-frequency limits: comparison with simple theory.

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Abstract
The Wiener spectra of 5 screen-film systems were studied as a function of monoenergetic X-ray energy. These spectra, in their low-frequency limits, were seen to depend linearly on X-ray energy. The Wiener spectra also decreased in magnitude as the incident X-ray energy exceeded that of the screen phosphor K absorption edge. The agreement of these experimental findings with simple theoretical predictions is discussed and related to radiographic imaging.