Study Of Molded Scintillator Radiation Hardness

Preliminary results on the degradation of molded scintillator light yield after irradiation are presented. Phenomenological model for radiation damage of scintillator is proposed. It's parameters are fit with the data. The predictions for the evolution of ATLAS Tile calorimeter scintillators under real experimental conditions are made. 1 Introduction Plastic scintillator modifies it's scintillation properties and transparency under irradiation. This modification depends essentially on the type of scintillator and have ruther complicated dynamic behaviour due to the processes of destruction and restoration (annealing) of it's chemical components. To predict long term changes in scintillators performance under real experimental conditions, when irradiation lasts for a couple of years, one have to take data at much higher irradiation rate and to have some model on the rate dependence. 2 Experimental set-up and data Scintillation tiles were produced by injection molding technique [1] at ..