Hydrology and Earth System Sciences
Hydrology and Earth System Sciences
HESS
Articles | Volume 30, issue 6
Articles | Volume 30, issue 6
https://doi.org/10.5194/hess-30-1523-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-30-1523-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 30, issue 6
Research article
 | 
25 Mar 2026
Research article |  | 25 Mar 2026

Different tracer, different bias: using radon to reveal flow paths beyond the Window of Detection

Johanna Bacher, Julian Klaus, Adam S. Ward, Jasmine Krause, Catalina Segura, and Clarissa Glaser

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Short summary
Understanding solute transport often relies on slug tracer experiments. These experiments are biassed toward capturing faster flow paths and miss longer timescales. We explore integrating a slug-injected tracer with naturally occurring radon to quantify flow paths across different timescales at the reach scale. We show that jointly calibrating a transient storage model with both tracers strengthens parameter constraints and improves solute transport estimates in future studies.
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