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Sample volume optimization for radon-in-water detection by liquid scintillation counting.

Michael Schubert¹, Juergen Kopitz², Stanisław Chałupnik³

¹Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318 Leipzig, Germany.

Journal of Environmental Radioactivity

|April 8, 2014

Summary

Optimizing radon-in-water detection using liquid scintillation counting (LSC) involves adjusting sample volume. The study found that 500-900 ml water samples provide optimal count-rates and counting statistics for LSC analysis.

Keywords:

LSC Radon as aquatic tracer Sample volume optimization

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Area of Science:

Environmental Science
Analytical Chemistry
Radiochemistry

Background:

Radon (Rn) is a valuable environmental tracer, especially in aquatic systems.
Liquid Scintillation Counting (LSC) requires transferring radon from water samples to a scintillation cocktail.
Standard LSC vials have a fixed cocktail volume (20 ml), but optimal water sample volume is not defined.

Purpose of the Study:

To optimize the water sample volume for radon detection using LSC.
To minimize water sample volume without compromising count-rate and counting statistics.
To establish guidelines for efficient radon-in-water analysis.

Main Methods:

Development of an equation to calculate initial ²²²Rn concentration based on sample volumes, partition coefficient, and detected count-rate.
Experimental determination of optimal water sample volumes for LSC analysis.
Analysis of the relationship between water sample volume, headspace, cocktail volume, and radon count-rate.

Main Results:

Water sample volumes over 900 ml do not significantly improve count-rate or counting statistics.
Sample volumes below 500 ml result in noticeably lower count-rates and poorer counting statistics.
An optimal water sample volume range of 500-900 ml was identified for 20 ml LSC vials.

Conclusions:

For LSC-based radon-in-water detection using 20 ml vials, a sample volume between 500 ml and 900 ml is recommended.
This optimized volume range balances efficient radon transfer and measurement accuracy.
The study provides a practical guideline for improving radon analysis in aquatic environments.