Improving Light Yield Measurements for Low-Yield Scintillators
J. B. Cumming, S. Hans, and M. Yeh

TL;DR
This paper introduces light power spectra as a new, reliable method for measuring low light yields in scintillators, improving sensitivity down to 2% of high-yield levels, with applications demonstrated in various scintillator systems.
Contribution
It presents a novel approach using light power spectra for low-yield scintillator measurements, supported by theoretical analysis and practical applications.
Findings
Light power spectra enable reliable LY measurements at very low levels.
Derivative of light power spectrum improves measurement accuracy.
Method applicable to water-based and PPO+LAB scintillators.
Abstract
Light power spectra are introduced as a new tool for relative light yield (LY) determinations. Light event spectra have commonly been used for this purpose. Theoretical background supporting this change is provided. It is shown that the derivative of a light power spectrum can provide a reliable LY measurement at levels as low as 2% of those for high-yield liquid scintillators. Applications to light evolution in the PPO+LAB system and to water-based liquid scintillators are described.
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