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Chapter 18

A Comparison of Analytical Methods for Screening Gross Alpha and Beta Radioactivity in Water by Liquid Scintillation Counting and Gas Flow Proportional Counting

The radiation exposure through drinking-water comprises: naturally occurring radioactive species radium-226/228 and a few others. The classical approach to radioactivity measurements in drinking water consists of evaporating a known volume of water and measure the activity of the residue in a glass flow proportional counter; an attractive alternative to classical methods is the ultra-low level liquid scintillation counting coupled to alpha–beta discrimination. The main aim of this work is to compare these two methodologies, considering an identical initial step of pre-concentration, in terms of: principles involved in the measurement (efficiency, measuring time, background radiation); minimal detectable activity; time to perform the analysis.

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27 Jul 2015
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