Abstract

The effects of nuclear radiation, moisture absorption, and temperature history on replica flat mirrors of filled epoxy have been investigated using the optical flat testing method. A radiation dose of the order of 1010 ergs per gram is required to produce changes in surface flatness. Residual activity after neutron irradiation is found to be somewhat less than that of Pyrex glass. Absorption of a fractional percent of water causes a loss of flatness, but flatness can be restored by removing the moisture with elevated temperature baking. Flats appear to survive temperature cycling from −200 to +125°C with little detectable changes. Upon being subjected to temperatures above 140°C, the flatness decreases and the reflecting surface deteriorates rapidly.

© 1961 Optical Society of America

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