Impact of lowering potassium contamination in liquid scintillation cocktails for ultra-sensitive radiation detection
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY(2023)
摘要
Intrinsic ^40 K radioactive backgrounds from impurities of natural K in liquid scintillation cocktails have previously been demonstrated to limit their use in ultra-sensitive applications. This work explores two methodologies in parallel for the reduction of ^40 K backgrounds in the cocktails, and lays the groundwork for use in ultra-sensitive applications. In one method, alternative low-K liquid scintillation matrix constituents were identified and in the other, a simple purification method for single components and finished cocktails was developed. Both methods were verified via ICP-MS analysis. Liquid scintillation counting of selected purified cocktails demonstrated background reduction, improved stability, and enhanced performance. The best performing purified cocktail was also counted on a custom-built ultra-low background liquid scintillation counter, with results below the detector background.
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关键词
Ultra-pure scintillator,Radiation detection,ICP-MS analysis,Potassium,Liquid scintillation counting
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