Title: Radiation Hardness Test of Eljen EJ-500 Optical Cement,
Abstract: We present a comprehensive account of the proton radiation hardness of Eljen
Technology's EJ-500 optical cement used in the construction of experiment
detectors. The cement was embedded into five plastic scintillator tiles which
were each exposed to one of five different levels of radiation by a 50 MeV
proton beam produced at the 88-Inch Cyclotron at Lawrence Berkeley National
Laboratory. A cosmic ray telescope setup was used to measure signal amplitudes
before and after irradiation. Another post-radiation measurement was taken four
months after the experiment to investigate whether the radiation damage to the
cement recovers after a short amount of time. We verified that the radiation
damage to the tiles increased with increasing dose but showed significant
improvement after the four months time interval.