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Applied Optics

Applied Optics


  • Vol. 23, Iss. 16 — Aug. 15, 1984
  • pp: 2788–2790

Ultraviolet converter transients induced by electrons

R. L. Kernell, J. Becher, and C. S. Reft  »View Author Affiliations

Applied Optics, Vol. 23, Issue 16, pp. 2788-2790 (1984)

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The output of ultraviolet converters typically used in satellite astronomy was monitored during irradiation with electrons from a sealed 90Sr source which approximated the peak flux in earth’s outer electron belt. The signal induced by irradiation was attributed to two mechanisms: (1) photoelectrons resulting from photons created in the MgF2 window and (2) the direct impact of electrons on the phosphor. For irradiation the at ~1 × 107 e/cm2 sec, these two effects produced signals which were, in order of magnitude, the same as those produced by an incident UV flux (254 nm) of 108 and 107 photons/cm2 sec, respectively. In addition, the induced signal was investigated as a function of electron energy by irradiating another converter with 0.4–1.8-MeV electrons from a Van de Graaff. These results suggest that the dominant contribution to the electron-induced signal is Cerenkov photon production in the MgF2 window.

© 1984 Optical Society of America

Original Manuscript: September 15, 1983
Published: August 15, 1984

R. L. Kernell, J. Becher, and C. S. Reft, "Ultraviolet converter transients induced by electrons," Appl. Opt. 23, 2788-2790 (1984)

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  1. M. J. Berger, S. M. Seltzer, “Additional Stopping Power and Range Tables for Protons, Mesons and Electrons,” NASA Spec. Publ. SP-3036 (1966).
  2. W. Viehmann, A. G. Eubanks, G. F. Pieper, J. H. Bredekamp, “Photomultiplier Window Materials Under Electron Irradiation: Fluorescence and Phosphorescence,” Appl. Opt. 14, 2104 (1975). [CrossRef] [PubMed]

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