利用Lomb-Scargle傅里叶变换法和统计折叠周期分析法，对2009年8月到2011年10月期间西藏羊八井国际宇宙线站的ARGO实验大厅内的氡浓度监测数据进行研究。结果表明，实验大厅内的氡浓度具有1日和半日周期变化规律，其中以1日周期变化为主。在1 d中氡浓度的平均值为(567.2±1.1) Bq/m3，变化幅度为(79.0±1.4) Bq/m3，北京时间约11：20时达到最大，北京时间约23：20达到最小。分析还表明，在一年中月平均浓度的最小值出现在6月份，而较大值出现在下半年的某些月份，每月的日变化幅度和浓度最大时的时间多变。这些结果对环境氡的浓度变化规律及其相关理论模型研究具有重要的意义，同时对西藏地区居住环境监测评价提供了重要的参考。
Using the Lomb-Scargle period grams and temporal variation folded into one period for statistical analysis, the radon concentration in the ARGO-YBJ experiment hall from Aug. 2009 through Apr. 2011 was investigated. Our results show that the radon concentration has main periods of half-day and 1-day with the period of 1 day being dominant. In one day the radon concentration reaches its peak at 11:20 (Beijing Time) and reaches the minimum at 23:20(Beijing Time). In one year, the radon concentration is lower in June, the monthly variation amplitudes and initial phases folded into one day are various. These results are of importance to the study of variation of radon concentration and theoretical models, and provide a good chance to estimate the living environment in Tibet.
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