Comparison of p-terphenyl and 2,2" dimethyl-p-terphenyl as waveshifters for barium fluoride

Timothy A. DeVol; David K. Wehe; Glenn F. Knoll

doi:10.1117/12.138601

22 December 1992 Comparison of p-terphenyl and 2,2" dimethyl-p-terphenyl as waveshifters for barium fluoride

Timothy A. DeVol, David K. Wehe, Glenn F. Knoll

Proceedings Volume 1734, Gamma-Ray Detectors; (1992) https://doi.org/10.1117/12.138601
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Timothy A. DeVol, David K. Wehe, and 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); https://doi.org/10.1117/12.138601

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available