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目的通过对成都市2012-2014年地表γ辐射水平进行监测、分析,探讨成都市地表γ辐射水平差异及影响因素。方法使用FD-3013B智能化γ辐射仪,按照布点方案,监测人群聚集区室外和室内的γ辐射剂量率,用SPSS进行数据分析。结果本次共有3 188个监测点,其中成都市室内653个点,室外监测点数为2 535个点。对室内外、不同建筑结构、不同道路路面的地表γ辐射剂量率进行分析,结果表明中心城区室内地表γ辐射剂量率均值(108.0 n Gy·h-1)、室外地表γ辐射剂量率均值(74.5 n Gy·h-1)均高于郊区(室内88.7n Gy·h-1、室外63.5 n Gy·h-1)。不同地面道路γ辐射剂量率水平有差异,其中花岗岩路面最高,均值为84.4 n Gy·h-1。结论影响成都市地表γ辐射水平的主要因素是建筑密度、不同道路路面。
Objective To monitor and analyze the surface gamma radiation level in Chengdu from 2012 to 2014, and to explore the differences and influencing factors on the surface gamma radiation level in Chengdu. Methods The FD-3013B intelligent γ-ray radiometer was used to monitor the dose rate of γ-radiation in outdoor and indoor areas in population gathering area according to the distribution plan. The data were analyzed by SPSS. As a result, a total of 3 188 sites were monitored, of which 653 were indoor in Chengdu and 2 535 were outdoor monitored. The analysis of surface gamma radiation dose rate indoors and outdoors, different building structures and different road pavements shows that the average indoor γ radiation dose rate (108.0 n Gy · h-1) and the average outdoor γ radiation dose rate (74.5 n Gy · h-1) were higher than those in the suburbs (88.7n Gy · h-1 in indoor and 63.5 n Gy · h-1 in outdoor). There are differences in the levels of γ radiation dose rates between different ground roads, with the granite pavement being the highest with an average of 84.4 n Gy · h-1. Conclusion The main factors influencing the surface gamma radiation in Chengdu are the building density, different road pavement.