✍ Scribed by Arthur J. Kamp; F.A. Blanchard
No coin nor oath required. For personal study only.
The use of Cerenkov counting for the assay of high-energy beta emitters has gained in popularity in recent years (l-3). High-energy beta emitters are readily counted with high efficiencies by the liquid scintillation technique. However, there are limitations. Chemical quenching gives large apparent energy shifts. Homogeneous sample sizes are often severely limited by solubility in the scintillator solvents. The use of Gerenkov counting eliminates several of the problems associated with liquid scintillation. There are no chemical quench effects. In many cases, sample sizes may be increased considerably since any transparent liquid medium may be used to generate Gerenkov radiation. No scintillator is necessary. No special equipment is needed, since any liquid scintillation spectrometer may be used for counting.
One drawback has been that methods for correction of color quenching are not well developed. Previously reported channels ratio methods have been rather insensitive to efficiency changes (4). A method employing external source efficiency has been reported ( 5), but, as in scintillation counting, this method is sensitive to small changes in sample size and source positioning.
This paper reports new developments in channels ratio methods which are sensitive to efficiency changes. Also presented is an external source channels ratio method that provides good sensitivity and reproducibility for the determination of counting efficiencies.
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