Regional aging and longevity characteristics in China

The factors that influence the length of human life are complex and longevity remains a controversial topic, particularly in China. This paper demonstrates the spatial patterns and changes of the elderly group (65 years old and over), the oldest old (80 years old and over) and the centenarians in China in the last decade, analyzes the influence of economic development on aging, and in the end, using a case study, explores the characteristics of the centenarians’ behavior. The results indicate that high elderly and the oldest old proportions are more common in regions with higher socio-economic development and that have a favorable climate. Centenarian distribution pattern is less influenced by economic but only for few regions. Lifestyle factors, such as sufficient sleep, positive mental state and a light diet are also largely found among the centenarian group.     

南宁市某办公室内氡平衡因子变化规律研究

目的 研究室内环境中氡平衡因子数值水平和变化范围。方法 在南宁市某室内工作场所中，开展了为期1年的氡浓度和平衡当量氡浓度同地点同时连续测量，氡气体和氡子体有效数据获取率分别为99.9%和86.7%。结果 测量结果表明，该室内环境中，氡年平均活度浓度和平衡当量氡浓度分别为（50.9±20.7）和（15.5±10.1） Bq/m³，二者均观测到了一致的日变化和季节性变化规律；平衡因子年均值为0.30±0.12，没有观测到日变化规律，但发现平衡因子月均值的年分布同氡浓度及氡子体浓度分布趋势类似，最高值和最低值出现在11月和6月，分别为0.47±0.24和0.19±0.06。结论 平衡因子月均值的波动，推测是不同季节室内通风状态不同导致。该结果提示，基于氡气体浓度估算氡暴露年有效剂量时，平衡因子取值有可能带来较大的不确定度，应该谨慎。