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Description
In this article the properties of four new luminophores, from the group of bifluorenes and other substances with multiple aromatic rings, were measured and studied for possible use in liquid scintillation, namely 1-phenyl-3-(2,4,6-trimethyl-phenyl)-2-pyrazoline, 2,2´,7,7´-tetrakis(N,N-diphenyl-amino)-9,9´-spirobifluorene, 2-(4-biphenylyl)-6-phenylbenzoxazole and 9,9´-bifluorenyl. The measurement was also done for the most commonly used luminophore (2,5-diphenyloxazole (PPO)). To improve counting efficiency the wavelength shifters were added to scintillation cocktail, in particular POPOP and bis-MSB. The main effort was focused on the determination of sample load capacity of the cocktail, especially in the acidic, alkaline and neutral environment. Furthermore, the detection limit and FOM were determined. Quench resistance, an important factor responsible for a reduction in counting efficiency, was determined via the addition of CCl4 and PBS. Lastly, the stability and diffusion of the cocktails were measured. The results were compared with the commercially used Aqualight scintillation cocktail.
