Abstract

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

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References

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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]

1975 (1)

1966 (1)

M. J. Berger, S. M. Seltzer, “Additional Stopping Power and Range Tables for Protons, Mesons and Electrons,” NASA Spec. Publ. SP-3036 (1966).

Appl. Opt. (1)

NASA Spec. Publ. SP-3036 (1)

M. J. Berger, S. M. Seltzer, “Additional Stopping Power and Range Tables for Protons, Mesons and Electrons,” NASA Spec. Publ. SP-3036 (1966).

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Figures (3)

Fig. 1
Fig. 1

Component parts of a typical ultraviolet converter.

Fig. 2
Fig. 2

Experimental arrangement for irradiation of an UV converter.

Fig. 3
Fig. 3

Energy dependence of the electron-induced signal in the ITT UV converter model F4122.

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