22 December 1992 Comparison of p-terphenyl and 2,2" dimethyl-p-terphenyl as waveshifters for barium fluoride
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p-Terphenyl (PTP) and 2,2' dimethyl-p-terphenyl (DMT) have been investigated for use as wavelength shifters (WLS) for barium fluoride (BaF2). These two organic fluors are attractive due to their: high quantum efficiency, fast fluorescence decay time, and emissions above the wavelength cut-off of borosilicate glass. Measurements of these WLS dissolved in cyclohexane are presented. Coincidence time spectra, and fluorescence decay spectra measured with BaF2 as the pump source, are shown. The fluorescence decay time and the ratio of fast to slow intensities were measured by a time correlated single photon technique. The increase in signal resulting from using a WLS between the photomultiplier tube (PMT) and the BaF2 crystal is measured. The motivation behind this work is the development of a gamma-ray spectrometer suitable for high count rate applications. We are investigating the possibility of separating the fast and slow emissions of BaF2 using optical techniques. For our measurements, PTP an DMT do not facilitate spectral separation due to the nature of their absorption and emissions spectra. A discussion of WLS properties needed to spectrally separate BaF2 emissions is presented.
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Timothy A. DeVol, Timothy A. DeVol, David K. Wehe, David K. Wehe, Glenn F. Knoll, Glenn F. Knoll, } "Comparison of p-terphenyl and 2,2" dimethyl-p-terphenyl as waveshifters for barium fluoride", Proc. SPIE 1734, Gamma-Ray Detectors, (22 December 1992); doi: 10.1117/12.138601; https://doi.org/10.1117/12.138601

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