Yao Meinan, Ding Kuke, Tang Xiaozhe, Wu Yunyun, Song Yanchao, Liu Shuyuan, Bai Bin, Zhang Li, Ma Yongzhong
Institute for Radiation Hygiene Protection, Beijing Center for Disease Prevention and Control, Beijing, China.
Chinese Center for Disease Control and Prevention, Beijing, China.
China CDC Wkly. 2024 Mar 29;6(13):272-276. doi: 10.46234/ccdcw2024.053.
Radon (Rn or radon) is a radioactive gas emitted from building materials, foundations, and soil. Children are especially susceptible to radon exposure, underscoring the need to assess indoor radon levels in kindergartens. This study monitored radon concentrations in 37 Beijing kindergartens from June to October 2023.
A random sample of 37 kindergartens was selected from 18 administrative districts in Beijing. The indoor radon concentration was measured using the solid track accumulation method, with radon detectors continuously monitored over a 3-month period.
The mean indoor radon level in 37 kindergartens, observed at 252 monitoring points, was 84.3 Bq/m, with values varying from 12.9 to 263.5 Bq/m. About 20.2% of points showed radon levels between 100.0 and 200.0 Bq/m, while 2.4% exceeded 200.0 Bq/m. Notably, radon levels were significantly elevated on the ground floor compared to the upper floors.
Indoor radon levels in 37 kindergartens remained below the national standard limit of 300.0 Bq/m for buildings (GB/T 16146-2015). Nonetheless, 18.9% of the kindergartens exceeded the 100.0 Bq/m limit set for new constructions. It is advised to improve radon monitoring in kindergartens and consider developing a national standard for maximum permissible radon levels in such facilities.
氡（Rn或氡气）是一种从建筑材料、地基和土壤中释放出来的放射性气体。儿童尤其容易受到氡暴露的影响，这凸显了评估幼儿园室内氡水平的必要性。本研究于2023年6月至10月对北京37所幼儿园的氡浓度进行了监测。
从北京18个行政区中随机抽取37所幼儿园作为样本。采用固体径迹累积法测量室内氡浓度，氡探测器连续监测3个月。
在252个监测点对37所幼儿园的室内氡水平进行观测，平均氡水平为84.3贝克勒尔/立方米，数值范围在12.9至263.5贝克勒尔/立方米之间。约20.2%的监测点氡水平在100.0至200.0贝克勒尔/立方米之间，而2.4%的监测点超过200.0贝克勒尔/立方米。值得注意的是，与上层相比，一楼的氡水平显著升高。
37所幼儿园的室内氡水平仍低于国家建筑标准限值300.0贝克勒尔/立方米（GB/T 16146 - 2015）。尽管如此，18.9%的幼儿园超过了新建建筑设定的100.0贝克勒尔/立方米的限值。建议加强幼儿园的氡监测，并考虑制定此类设施中氡的最大允许水平的国家标准。
