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<p>To mitigate the influence of humidity on accurate measurement of <sup>220</sup>Rn activity concentration by radon monitors, a dynamic humidity control system based on dual gas-path mixing was developed. The system enables rapid and stable regulation of relative humidity over the range of 2.5–75.5% RH and was applied in <sup>220</sup>Rn calibration experiments. Using flow-through <sup>220</sup>Rn sources with activities of 19.0&#xa0;Bq and 24.6&#xa0;Bq, calibration experiments were carried out for three radon monitors (RAD7, FYCDY-P30, and AlphaGUARD DF2000) at the Radon Laboratory of the University of South China, and the corresponding correction factors were determined. In addition, calibration experiments were performed using the 19.0&#xa0;Bq <sup>220</sup>Rn source for FYCDY-P30 and AlphaGUARD DF2000 at controlled relative humidity levels of 20.0 ± 0.6%, 40.0 ± 0.6%, and 60.0 ± 0.5% RH. The results show that, for each monitor, the correction factors obtained at the two activity levels are consistent (relative deviation &lt; 10%), indicating good linearity within this activity range. However, noticeable differences in correction factors were observed between the instruments, which can mainly be attributed to differences in detection principles and internal data-processing algorithms. The humidity-dependent calibration experiments further indicate that the correction factors of FYCDY-P30 range from 1.11 to 1.16, whereas those of AlphaGUARD DF2000 range from 1.47 to 1.53 under the tested humidity conditions. These results confirm the feasibility of the developed humidity control system and demonstrate the reliability of the calibration method, providing a practical basis for accurate calibration and measurement of <sup>220</sup>Rn concentration.</p>

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Development and application of a dynamic humidity control system for calibration of 220Rn monitors

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Shun Kuang,
  • Zhengzhong He,
  • Jing Wang,
  • Xiaoxia Yu,
  • Lidan Lv

摘要

To mitigate the influence of humidity on accurate measurement of 220Rn activity concentration by radon monitors, a dynamic humidity control system based on dual gas-path mixing was developed. The system enables rapid and stable regulation of relative humidity over the range of 2.5–75.5% RH and was applied in 220Rn calibration experiments. Using flow-through 220Rn sources with activities of 19.0 Bq and 24.6 Bq, calibration experiments were carried out for three radon monitors (RAD7, FYCDY-P30, and AlphaGUARD DF2000) at the Radon Laboratory of the University of South China, and the corresponding correction factors were determined. In addition, calibration experiments were performed using the 19.0 Bq 220Rn source for FYCDY-P30 and AlphaGUARD DF2000 at controlled relative humidity levels of 20.0 ± 0.6%, 40.0 ± 0.6%, and 60.0 ± 0.5% RH. The results show that, for each monitor, the correction factors obtained at the two activity levels are consistent (relative deviation < 10%), indicating good linearity within this activity range. However, noticeable differences in correction factors were observed between the instruments, which can mainly be attributed to differences in detection principles and internal data-processing algorithms. The humidity-dependent calibration experiments further indicate that the correction factors of FYCDY-P30 range from 1.11 to 1.16, whereas those of AlphaGUARD DF2000 range from 1.47 to 1.53 under the tested humidity conditions. These results confirm the feasibility of the developed humidity control system and demonstrate the reliability of the calibration method, providing a practical basis for accurate calibration and measurement of 220Rn concentration.