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<p><sup>210</sup>Po is a natural radioactive nuclide, belonging to the uranium series decay product, with high toxicity alpha radiation characteristics, widely present in environmental media such as soil. It poses a potential internal radiation risk to human health, therefore accurate monitoring of <sup>210</sup>Po in soil is of great significance for public health and radiation environment regulation. At present, there is a lack of standardized analysis methods for <sup>210</sup>Po in soil media both domestically and internationally, resulting in inconsistent quality of monitoring data. Based on extensive literature research and multi institutional experimental verification, this study proposes a soil <sup>210</sup>Po analysis method that combines wet acid digestion and spontaneous deposition followed by alpha spectroscopy. The HNO<sub>3</sub> + HCl + HF (3:2:1) mixed acid system is used to optimize key parameters such as digestion temperature (160&#xa0;°C), self deposition acidity (0.2–0.5&#xa0;mol/L HCl), and ascorbic acid dosage (0.5&#xa0;g). The method has been validated by 8 radiation monitoring institutions in China, showing a method detection limit (MDL) of 1.0 × 10<sup>−3</sup>&#xa0;Bq/g and a limit of quantification (LOQ) of 4.0 × 10<sup>−3</sup>&#xa0;Bq/g, a precision (RSD) of 2.5–14% and a spike recovery rate of 107–108% for method accuracy evaluation. It has good accuracy, repeatability, and universality, and is suitable for daily environmental monitoring needs.</p>

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Study on radiochemical analysis of 210Po in soil

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Tang Hui,
  • Jiang Qiao,
  • Zhu Songlin,
  • Yang Qiang,
  • Gu Hong,
  • Liu Pei,
  • Hong Tao,
  • Li Zehua,
  • Leng Yangchun

摘要

210Po is a natural radioactive nuclide, belonging to the uranium series decay product, with high toxicity alpha radiation characteristics, widely present in environmental media such as soil. It poses a potential internal radiation risk to human health, therefore accurate monitoring of 210Po in soil is of great significance for public health and radiation environment regulation. At present, there is a lack of standardized analysis methods for 210Po in soil media both domestically and internationally, resulting in inconsistent quality of monitoring data. Based on extensive literature research and multi institutional experimental verification, this study proposes a soil 210Po analysis method that combines wet acid digestion and spontaneous deposition followed by alpha spectroscopy. The HNO3 + HCl + HF (3:2:1) mixed acid system is used to optimize key parameters such as digestion temperature (160 °C), self deposition acidity (0.2–0.5 mol/L HCl), and ascorbic acid dosage (0.5 g). The method has been validated by 8 radiation monitoring institutions in China, showing a method detection limit (MDL) of 1.0 × 10−3 Bq/g and a limit of quantification (LOQ) of 4.0 × 10−3 Bq/g, a precision (RSD) of 2.5–14% and a spike recovery rate of 107–108% for method accuracy evaluation. It has good accuracy, repeatability, and universality, and is suitable for daily environmental monitoring needs.