典型办公室内氡浓度水平的时间性变化

目的了解典型办公场所内氡浓度水平随时间变化规律,为开展办公室内氡浓度水平调查或评价提供有效方案。方法选取典型办公室1间,用脉冲电离室测氡仪AlphaGUARD～开展9个月的连续测量,通过对测量数据的统计,分析办公室内氡浓度水平的变化规律。结果在9个月内,办公室内氡浓度的最大日均值、周均值、月均值以及季度均值与相应的最小值比分别为6.27、2.63、1.41和1.09;周末与工作日平均氡浓度的比值为1.17,工作日中上、下班时间段的平均氡浓度比值为0.86。结论办公场所内氡浓度水平虽然随时间变化,但3个月的连续测量均值基本可反映办公室内氡浓度的年度均值。

Timely Variations of 222Rn Concentrations in a Typical Office

Objective To understand the variation behaviors of 222Rn concentrations with time in typical offices,and to provide an effective measure for carrying out the investigation or evaluation of 222Rn concentrations in offices.Methods The concentrations of 222Rn in a selected office were continuously monitored with the AlphaGUARD~ for 9 months.The timely variations of 222Rn concentrations were statistically analyzed based on the measured data.Results Throughout the measurement period,the ratios of the maxima to the minima of daily averages,weekly averages,monthly and seasonal averages of 222Rn concentrations were 6.27,2.63,1.41 and 1.09,respectively.The ratio of averaged 222Rn concentration in weekends to that in weekdays was 1.17.During workdays,the averaged 222Rn concentration in working hours was 0.88 of that after working.Conclusion Although 222Rn concentrations in offices also change over time,the annual average of 222Rn concentration in an office can be approximately obtained with a 3 months of continuous measurement.