Radon is a radioactive pollutant that could pose hazards to the surrounding environment and people due to its radioactive decay progenies. In this study, numerical simulations of radon dispersion were conducted under natural and mechanical ventilation with an air-purifier for radon. Factors such as the air supply speed, position and air supply angles of the purifier were considered. Results showed that the increase in the air supply speed from the purifier was an effective solution to reduce indoor radon pollution. The effect was better when the purifier was in the middle of the room. The purification effect was similar when the air supply changed under natural ventilation, while purification function was more effective when the air supply angle was 60° under the mechanical ventilation condition. An effective dose estimation involving typical ventilation schemes with radon purifier was evaluated. Using this approach, the radiation effect on occupants was computed. The calculated effective dose was 0.9 mSv y−1 when the air supply speed of the purifier was 0.2 m s−1 under natural ventilation. As a result, the effective dose calculated was under the annual effective dose limit of 3–10 mSv y−1 recommended by the International Commission on Radiological Protection (ICRP) for public exposure.

中文翻译：

---

空气净化器典型通风方案氡扩散和剂量评估的数值研究

氡是一种放射性污染物，由于其放射性衰变后代可能对周围环境和人类造成危害。在这项研究中，氡气扩散的数值模拟是在自然通风和机械通风下使用氡空气净化器进行的。考虑了净化器的送风速度、位置、送风角度等因素。结果表明，提高净化器送风速度是减少室内氡污染的有效方法。净化器在房间中间时效果更好。自然通风下换气时净化效果相似，而机械通风条件下送风角度为60°时净化效果更佳。评估了一个有效剂量估计，包括典型的氡净化器通风方案。使用这种方法，计算了对居住者的辐射影响。自然通风下净化器送风速度为0.2 mS-1时计算的有效剂量为0.9 mSv y-1。因此，计算出的有效剂量低于国际放射防护委员会 (ICRP) 建议的公众照射年有效剂量限值 3–10 mSv y−1。