Annual average indoor radon variations over two decades.
Annual average indoor radon variations over two decades.
复制标题
二十年来室内氡气年平均变化。
DOI：
10.1097/01.hp.0000326449.27077.3c
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发表时间：
2009
期刊：
影响因子：
2.2
通讯作者：
Steck,DJ
中科院分区：
文献类型：
--
作者：
Steck,DJ
长期暴露于氡（222 Rn）浓度升高与肺癌风险增加有关。对当代氡浓度进行长达一年的测量一直是流行病学家试图重建过去氡暴露和房主试图估计未来氡暴露的“黄金标准”。随机变化和持续的时间趋势会影响补救行动的决定和流行病学研究得出的风险系数。当家庭的结构、气候、环境或居住者发生变化时，时间波动是可能的。年平均时间氡行为进行了研究，在196个地点在98明尼苏达州的房子。从1983年到2000年进行了1700年的室内氡测量，以确定每年的氡波动和长期的时间趋势。在典型地点进行了为期13年的10年测量。氡浓度中位数为120 Bq m− 3。这组房屋的氡浓度中位数几乎没有逐年变化，也没有持续的时间趋势。在个别地点，每年的氡变化范围从3%到110%。中位变异为26%。气候、风暴露和氡气浓度会影响逐年变化，但房屋年龄、建筑或测量楼层不会影响。当对房屋结构和供暖通风系统进行修改时，一些个别地点的氡变化明显较大。一楼一年之久的氡测量提供了更好的估计累积氡暴露比筛选测量。本研究中观察到的氡变化提供了一年之久的测量，可以帮助改善补救决策协议和改进流行病学研究的风险估计的不确定性估计。
Long-term exposure to elevated radon (222 Rn) concentrations has been linked to increased lung cancer risk. Year-long measurements of contemporary radon concentrations have been the “gold standard” for epidemiologists trying to reconstruct past radon exposures and for homeowners trying to estimate future radon exposure. Random variations and persistent temporal trends can affect remedial action decisions and risk coefficients derived from epidemiological studies. Temporal fluctuations are possible when changes occur in a home’s structure, climate, environment, or occupants. The annual-average temporal radon behavior was studied at 196 sites in 98 Minnesota houses. Seventeen hundred year-long indoor radon measurements were made from 1983 to 2000 to determine year-to-year radon fluctuations and long-term temporal trends. Ten year-long measurements over a span of 13 years were made at the typical site. The median radon concentration was 120 Bq m− 3. The median radon concentration of the group of houses showed little year-to-year variation and no persistent temporal trends. At individual sites, year-to-year radon variations ranged from 3 to 110%. The median variation was 26%. Climate, exposure to wind, and radon concentration affected year-to-year variation, but house age, construction, or measurement floor did not. Some individual sites showed significantly larger radon changes when modifications were made to the house structure and heating-ventilation systems. Year-long radon measurements on the first floor provided better estimates of cumulative radon exposure than screening measurements. The radon variations observed in this study provide uncertainty estimates for year-long measurements that could help improve remediation decision protocols and refine risk estimates from epidemiological studies.