Radiation Damage of F8 Lead Glass with 20 MeV Electrons
  Using a 20 MeV linear accelerator, we investigate the effects of electromagnetic radiation on the optical transparency of F8 lead glass. Specifically, we measure the change in attenuation length as a function of radiation dose. Comparing our results to similar work that utilized a proton beam, we conclude that F8 lead glass is more susceptible to proton damage than electron damage. 
B. D. Schaefer, R. E. Mitchell, P. McChesney, M. R. Shepherd, J. M.   Frye
physics.ins-det