Study on the effect of Fresh Air Ventilation system for reducing indoor 222Rn

Q1 Health Professions Radiation Medicine and Protection Pub Date : 2024-03-01 Epub Date: 2024-02-06 DOI:10.1016/j.radmp.2024.02.001

Yanchao Song , Dexing Lian , Hongxing Cui , Changsong Hou , Yunyun Wu

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Abstract

Objective

To explore the reduction effect for the indoor ²²²Rn (Rn) by Fresh Air Ventilation (FAV) system, a novel commercial ventilation device in China.

Methods

The indoor concentrations of Rn and its decay products (RnD) in three residential rooms, two in Beijing and one in Hefei city, Anhui province, before and after FAVS functioned were measured using an active continuous method. The air exchange rate was monitored by measuring CO₂ concentration using the tracer gas method.

Results

In the three rooms, the FAVS reduced the Rn concentrations from (162 ± 80) Bq/m³ to (63 ± 22) Bq/m³ and decreased the RnD concentrations from (64 ± 35) Bq/m³ to (13 ± 6) Bq/m³ on average, a decrease of (59 ± 25)% in the Rn concentrations and a drop of (77 ± 18)% in the RnD concentrations. Considering dose conversion factors of Rn and RnD, FAVS decreased the exposure dose by (76 ± 20)%. Besides, FAVS increased the air exchange rates from 0.17 h⁻¹ to 0.56 h⁻¹ on average.

Conclusions

FAVS can effectively reduce indoor Rn and RnD concentrations by improving the air exchange, serving as a valuable supplement to existing radon mitigation methods, especially in extreme climates.

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研究新风换气系统对减少室内 222Rn 的影响

方法采用主动连续法测量了三个住宅房间（两个位于北京市，一个位于安徽省合肥市）在新风换气系统运行前后的室内 Rn 及其衰变产物（RnD）浓度。结果在这三个房间中，FAVS 平均将 Rn 浓度从 (162 ± 80) Bq/m3 降至 (63 ± 22) Bq/m3，将 RnD 浓度从 (64 ± 35) Bq/m3 降至 (13 ± 6) Bq/m3，Rn 浓度下降了 (59 ± 25)%，RnD 浓度下降了 (77 ± 18)%。考虑到 Rn 和 RnD 的剂量换算系数，FAVS 使暴露剂量减少了 (76 ± 20)%。此外，FAVS 还将空气交换率从平均 0.17 h-1 提高到 0.56 h-1。结论FAVS 可以通过改善空气交换有效降低室内 Rn 和 RnD 浓度，是现有氡减缓方法的重要补充，尤其是在极端气候条件下。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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