Rate of long-term bleaching in FK 51 optical glass darkened by Co60 ionizing radiation at dose rates of 10 krad/hr and 7rad/hr

G. Richard Wirtenson; Richard H. White

doi:10.1117/12.279016

17 October 1997 Rate of long-term bleaching in FK 51 optical glass darkened by Co60 ionizing radiation at dose rates of 10 krad/hr and 7rad/hr

G. Richard Wirtenson, Richard H. White

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Proceedings Volume 3124, Photonics for Space Environments V; (1997) https://doi.org/10.1117/12.279016
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

A previous paper presented long term bleaching data on various glasses exposed to 10.6 krad of ionizing radiation. All the glasses mported except FK 51 have readily available "G" glass equivalents that are stabilized to the natural space environment. Yet, FK 51, because of its location on the Abbe diagram is extremely useful in certain lens design applications. To more fully explore the bleaching ofFK 51, after the initial dose of 10.6 had at 1 1.8 krad/hour, we inadiated three more samples at a similar dose rate but to different total doses. Since the dose rate for this study was significantly higher than the dose rate anticipated for glasses in a shielded space-based lens system (-3 md/day), additional data wei obtained at a lower rate of 7 md/hour. While this dose rate is still higher than the anticipated operational rate, it is more than 1000 times lower than the dose rate used for our initial studies. The bleaching rate for the samples exposed at the lower dose rate is considerably less than for the samples exposed at the higher rate.

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G. Richard Wirtenson and Richard H. White "Rate of long-term bleaching in FK 51 optical glass darkened by Co60 ionizing radiation at dose rates of 10 krad/hr and 7rad/hr", Proc. SPIE 3124, Photonics for Space Environments V, (17 October 1997); https://doi.org/10.1117/12.279016

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KEYWORDS

Glasses

Absorption

Ionizing radiation

Lens design

Error analysis

Fluorine

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