Abstract
The shift of the pulse height spectrum and the relative counting efficiency of 32P Cerenkov radiation in water were examined using a liquid scintillation spectrometer. This shift was related to the spectrophotometric absorbancy of samples containing various dyes. The isotope channels ratio method of producing a counting efficiency correction curve was found to be effective for coloured samples. It was observed that although the addition of some chemicals to the sample caused little change in the counting efficiency, a suspending agent (Cabo-sil ∗®) produced a counting efficiency and spectral shift different from those obtained for the samples containing dyes. The absolute counting efficiency for 32P in water was found to be 30·5 per cent.
Published Version
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