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

The Wiener spectra of five 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.