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Reliability assessment of Sr90 measurements in aqueous solution in Italy: Insights from ILC-1
Susy Toma1, Marco Capogni2, Aldo Fazio2
1National Institute of Ionizing Radiation Metrology ENEA‑INMRI, Rome, Italy; Dept. of Electrical and Information Engineering, University of Cassino and Southern Lazio, Italy.
Abstract:
The accurate determination of Sr90 in aqueous matrices remains a significant challenge in environmental radioanalysis due to their low activity levels, complex sample preparation, and potential interferences. This study presents the results of the Interlaboratory Comparison "Activity of radionuclides (gamma emitters + Sr90) in an aqueous liquid solution ILC-1," conducted in 2022 as part of the National Program on the Reliability of Ionizing Radiation Measurements. The program, coordinated by the Italian National Institute of Ionizing Radiation Metrology (ENEA-INMRI) under the Ministry of Enterprises and Made in Italy (MIMIT), involved 34 laboratories across Italy and aimed to assess the accuracy, uncertainty estimation, and traceability of measurements of both gamma and beta-emitting radionuclides. Sr90 activity concentrations were measured using radiochemical methods, and all results were compared against a reference value traceable to national primary standard provided by ENEA-INMRI. The evaluation of participants' performance included the use of En statistical estimators and percent deviation metrics. The findings reveal variability in measurement outcomes, reflecting methodological differences and highlighting critical issues in uncertainty estimation and data reproducibility. This multi-laboratory investigation provides essential elements for improving quality-assurance practices and supporting more reliable 90Sr measurements in environmental monitoring.
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