The influence of temperature treatment before or after irradiation on the radiation damage of plastic scintillators and wavelength shifters has been measured. The PMMA (polymethyl methacrylate)-based wavelength shifters show strong recovery for heating in argon after irradiation, whereas the polystyrene-based scintillator SCSN-38 in air suffers from heating not only before but also after irradiation. UV absorbants added to wavelength shifter material Y-7 in PMMA are responsible for additional radiation damage in the scintillator/wavelength shifter system SCSN-38/Y-7 if their cutoff wavelengths are higher than 360 nm.
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