Ultraviolet converter transients induced by electrons

Details Ultraviolet converter transients induced by electrons Ultraviolet converter transients induced by electrons

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apopt..23.2788k&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 23, Aug. 15, 1984, p. 2788-2790.

Astronomy and Astrophysics

Astronomy

Electron Irradiation, Radiation Detectors, Radiation Effects, Satellite-Borne Instruments, Transient Response, Ultraviolet Radiation, Cerenkov Radiation, Converters, Iue, Magnesium Fluorides, Photoelectrons, Spaceborne Astronomy, Strontium 90, Van De Graaff Accelerators, Windows (Intervals)

Scientific paper

The output of ultraviolet converters typically used in satellite astronomy was monitored during irradiation with electrons from a sealed SR-90 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 at about 1 x 10 to the 7th e/sq cm 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 10 to the 8th and 10 to the 7th photons/sq cm 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.

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