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<p>In this study, we developed a method to measure radon daughter aerosols size distributions by combining wire mesh screens with an inertial impactor in a parallel sampling setup. The deviations between theoretical and actual cut-off diameters across the six channels were within 10%. Under high radon conditions, the concentrations of 218Po, <sup>214</sup>Pb, <sup>214</sup>Bi, and their equilibrium equivalent concentration (EEC) increased progressively with cut-off diameter. Both experimental data and EM algorithm simulations revealed a bimodal size distribution. These results demonstrate that the method provides high-resolution activity data for accurate respiratory deposition modeling.</p>

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Multi-channel parallel sampling and algorithmic analysis of radon daughter aerosols' activity size distribution

  • 期刊论文

  • 发表日期：

    2026年1月2日

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  • Yaqian Xie,
  • Fuping Wen,
  • Yi Liu,
  • Haitao Liao,
  • Renjie Wu

摘要

In this study, we developed a method to measure radon daughter aerosols size distributions by combining wire mesh screens with an inertial impactor in a parallel sampling setup. The deviations between theoretical and actual cut-off diameters across the six channels were within 10%. Under high radon conditions, the concentrations of 218Po, 214Pb, 214Bi, and their equilibrium equivalent concentration (EEC) increased progressively with cut-off diameter. Both experimental data and EM algorithm simulations revealed a bimodal size distribution. These results demonstrate that the method provides high-resolution activity data for accurate respiratory deposition modeling.