氡浓度的时间和空间变化特征

The Temporal and Spatial Variations of Radon Concentration.

目的 通过对成都某几个氡气观测实验室以及代表性建筑物的氡浓度测量，分析氡浓度的时间变化特点和垂直变化特点。方法 采用静电采集α粒子的方法，用RAD7便携式测氡仪对氡浓度进行长期连续观测。结果6：00～8：00时16：00～18：00时氡浓度最低，在9：00～11：00时及19：00～21：00时测量的氡浓度接近1d的平均值；春季和冬季氡浓度偏高，而夏季和秋季较低；氡浓度的变化与气压和相对湿度变化相似，与气温变化相反；随着高度的增加，氡浓度逐渐减小。结论在日常活动和工作时应该尽量避开氡浓度较高的时间段，室内应经常通风，对高层建筑物应重点作好较低楼层的降氡工作。

Objective To analyze the temporal and spatial variations of radon concentration by measuring in some labs and typical buildings in Chengdu, Methods Long term and continuous measurement has been carried out with RAD7 , by using electrostatic method to collect particle α. Results The minimum of radon concentration most occurs between 6：00- 8：00 and 16：00 - 18： 00, and between 9：00- 11：00 and 19：00 - 21：00 is close to the of the day average ; the radon concentration in spring and winter is higher than that in summer and autumn ; the radon variations is similar with atmosphere pressure and humidity , while contrary with temperature ; the concentration becomes lower with the increasing height. Conclusion We should avoid exposure to it during the periors of high radon concentration in our life and work, keep room ventilating , take measures to reduce radon concentration in lower floors, for the tall buidings.