An Investigation of Various Wavelength-shifting Compounds for Improving Counting Efficiency when 32p-( erenkov Radiation is Measured in Aqueous Samples
نویسنده
چکیده
Various water-soluble wavelength-shifting compounds were investigated to assess their suitability for the improvement of counting efficiency when ~erenkov radiation from phosphorous-32 is measured in a liquid scintillation counter. Of these compounds esculin, fl-methyl-umbelliferon and sodium salicylate led to the greatest improvement in counting efficiency. Especially esculin and fl-methyl-umbelliferon are fairly stable under a variety of experimental conditions and improve counting efficiencies by a factor of about 1.3 and 1.2, respectively. The use of ethanol as a water-miscible solvent combined with wavelength shifters soluble in both solvents does not improve counting efficiency.
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