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<p>This study presents an ion-chromatographic method for determining <sup>226</sup>Ra in aerosol samples using <sup>223</sup>Ra as a radiochemical yield tracer. A purified <sup>227</sup>Ac–<sup>223</sup>Ra tracer solution was prepared from certified uranium–radium equilibrium material and applied to optimize single-column chromatographic separation of radium on AG 50W resin with CyDTA eluents. The procedure enables accurate quantification of trace <sup>226</sup>Ra in aerosol filters with low minimum detectable activity and reliable chemical recoveries. For spiked samples containing <sup>226</sup>Ra, recoveries ranged from about 50%–80% with relative deviations below 5%, and an MDA of approximately 2&#xa0;mBq was achieved for 24&#xa0;h counting at the 95% confidence level. The optimized separation scheme is suitable for routine environmental monitoring of NORM-bearing aerosols and can also serve as a pre-concentration and purification step prior to ICP-MS-based <sup>226</sup>Ra analysis.</p>

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Optimized ion-chromatographic method for determining 226Ra in aerosols using 223Ra as a tracer

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Ping Xu,
  • Qingbiao Wu,
  • Yemian Li,
  • Sixuan Zhuang,
  • Yufei Wang,
  • Zuolong Zhu,
  • Lun Li,
  • Yinglin Ma

摘要

This study presents an ion-chromatographic method for determining 226Ra in aerosol samples using 223Ra as a radiochemical yield tracer. A purified 227Ac–223Ra tracer solution was prepared from certified uranium–radium equilibrium material and applied to optimize single-column chromatographic separation of radium on AG 50W resin with CyDTA eluents. The procedure enables accurate quantification of trace 226Ra in aerosol filters with low minimum detectable activity and reliable chemical recoveries. For spiked samples containing 226Ra, recoveries ranged from about 50%–80% with relative deviations below 5%, and an MDA of approximately 2 mBq was achieved for 24 h counting at the 95% confidence level. The optimized separation scheme is suitable for routine environmental monitoring of NORM-bearing aerosols and can also serve as a pre-concentration and purification step prior to ICP-MS-based 226Ra analysis.