  We study the effect ionizing radiation has on light transmission in the
wavelength range 190--1100~nm for a number of optically clear epoxies. We find
that the transmittance of traditional, commercially available, optical epoxies
show significant degradation for exposures of $1\times10^{12}$~MIPs/cm$^2$.
Degradation of light transmission progresses from the shortest wavelengths at
low doses to longer wavelengths as the dose increases. In epoxy joints that are
0.1~mm thick, we observe that more than 5\% of the light is lost for
wavelengths less than 400~nm for traditional optical epoxies. Our studies have
identified an optically clear epoxy that shows little degradation for radiation
exposures up to $5.9\times 10^{14}$~MIPs/cm$^2$ ($\approx 220$~kGy).
