Abstract
Cerenkov counting is often regarded as a modified version of liquid scintillation counting in which chemical quenching is not manifested. However, the mechanism of Cerenkov counting is such that changes in the concentration of reagents in the counting medium results in changes in Cerenkov counting efficiency. Large changes in counting efficiency occur for nuclides with low average beta energy values (Ēβ). The percent increase in Cerenkov counting efficiency in 4M HCl (relative to water) for various nuclides was found to be a smooth function of Ēβ. The relative change in counting efficiency for24Na,32P,42K and204Tl in HCl, NH4Cl and/or NaCl media are presented. The data emphasizes the need to keep the concentration of various chemicals in Cerenkov counting media constant, especially for nuclides with low Ēβ, values, in order to reproduce counting efficiency.
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