室内氡浓度的非线性分析

Nonlinear Analysis of Indoor Radon Concentration

氡是一种天然放射性气体,其中室内氡与人类健康密切相关,室内氡浓度成为公众关注的问题之一。假定室内外空气中氡及氡子体均一混合的前提下,推导出一个关于室内氡浓度计算的模型,据此计算室内氡浓度。结果表明：室内氡浓度随时间和通风量系数的增加,趋向一个稳定的值,最终达到室内外氡浓度平衡。该模型计算出的室内氡浓度理论值（6.35~40Bq/m3）与任天山和王玫等的实测结果（6~50Bq/m3）一致,表明模型可靠。

Radon is a natural radioactive noble gas that is naturally found in the ground. Exposure （excessive） to radon can pose a threat to the public health and get the public attention wordwide. Requiring the balanced mixing of radon and its daughters in indoor radon and outdoor air, a quantitative calculation model is deduced. The results showed that the indoor radon levels reach a steady value with the increases of ventilation radio and time, resulting in the balance for radon concentration indoor and outdoor air ultimately. Based on the model calculation, radon in door air has a theoretiacl value ranging between 6.35 and 40 Bq/m3, which are in accordance with the actual measurements（6.0~50 Bq/m3） by Tianshan Ren and Mei Wang, etc. The established quantitatively model for calculating the change of radon levels in indoor air could provide the technical support for indoor radon control and environmental assessment.