Radiation testing of optical glasses and crystals for Solar-B optical instruments.

Details Radiation testing of optical glasses and crystals for Solar-B optical instruments. Radiation testing of optical glasses and crystals for Solar-B optical instruments.

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998rnaoj...3..145n&link_type=abstract

Rep. Natl. Astron. Obs. Jpn., Vol. 3, No. 4, p. 145 - 150

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Space Instrumentation: Optical Materials

Scientific paper

This report gives some results of γ-ray irradiation (Co60 source) testing on optical glasses and crystals which may be used in the next Japanese solar space mission Solar-B. Ordinary optical glasses darken when exposed to high-energy radiation which is present in natural space environment. In case of Solar-B, whose orbit will be polar-sun-synchronous, the satellite will undergo the total dose of more than 1000 krad in five years. Hence it is very crucial for the success of the mission to know the feasibility of transmitting optical elements in space. The authors tested two kinds of fused silica, a fluorite, and ten kinds of UV transmitting glasses. Calcite was also tested. It was found that the fused silica is radiation-resistant but the other glasses and the fluorite are nonresistant and become quite opaque in UV and visible wavelength regions after the irradiation.

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