Abstract
The need for, and benefits of using, wavelength shifters with certain dark matter scintillator detectors is discussed. The dependence of conversion efficiency on thickness and incident wavelength is extensively investigated for evaporated coatings of p-terphenyl and tetraphenyl butadiene, and for plastic waveshifters based upon p-terphenyl. For the latter the effect of varying the p-terphenyl concentration is studied and some factors which must be considered when developing them for use in the UV are also discussed.
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