In this work, the radon exhalation, annual effective dose and excess lifetime cancer risks due to the exposure of radon released from raw building materials containing fly ash of different fractions were evaluated. The 226Ra and 222Rn concentrations were evaluated by the measurements on HPGe gamma spectrometer, RAD 7 radon detector combined with model calculation of radon exhalation for standard rooms. The results indicated that the emanation fraction for fly ash is lower than the corresponding value for soils and rocks. The surveyed building materials of containing fly ash can result in an indoor radon concentration up to 1.7 Bq m−3 which is below the recommended value of 100 Bq m−3 by WHO, the annual effective dose increases from 0.007 to 0.022 mSv year−1, the excess lifetime cancer risks ranges from 0.027 × 10–3 to 0.085 × 10–3 with the ratio of 3.2 for the additional fly ash content in cement up to 75%. In the meanwhile, it has a down trend and influences inconsiderably on these parameters for sand. The obtained mean annual effective doses are lower than the dose limitation of 10 mSv year−1 recommended for occupational workers.

中文翻译：

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使用粉煤灰建筑材料对氡气呼出率和潜在氡暴露导致的终生癌症风险的半实验评估

在这项工作中，评估了氡的呼出量、年有效剂量和由于暴露于含有不同组分飞灰的原材料释放的氡而导致的终生癌症风险。226Ra和222Rn浓度通过HPGe伽马光谱仪、RAD 7氡探测器的测量结合标准房间氡呼出的模型计算进行评估。结果表明，飞灰的散发率低于土壤和岩石的相应值。被调查的含粉煤灰建筑材料可导致室内氡浓度高达 1.7 Bq m-3，低于 WHO 推荐值 100 Bq m-3，年有效剂量从 0.007 增加到 0.022 mSv year-1 ，终生癌症风险从 0.027 × 10-3 到 0 不等。085 × 10-3 的比例为 3.2，水泥中的额外粉煤灰含量高达 75%。同时，它有下降趋势，对砂的这些参数影响不大。获得的平均年有效剂量低于为职业工人推荐的 10 mSv year−1 的剂量限制。