苏州市γ辐射空气吸收剂量率的特征分析

发布时间：2018-01-06 15:16

本文关键词：苏州市γ辐射空气吸收剂量率的特征分析　出处：《苏州科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：辐射存在于自然环境中,随着科技发展,γ射线已成为一种新型科技被普遍应用于我们的日常生活中。而苏州是核技术利用大市,放射源数量及活度均居于江苏省乃至全国前列。2011年3月11日日本福岛核电站放射性事故之后,社会公众对辐射环境质量关注高涨,迫切希望了解自身生存环境的辐射环境水平,政府也对此十分重视。为了掌握本市环境辐射污染源和辐射环境质量现状,分析研判我市空气环境辐射水平变化规律,本文研究利用苏州市范围内的γ空气环境辐射全面系统的监测数据(2010年-2014年),分析五年瞬时、连续、累积γ辐射空气吸收剂量率的空间分布特征、变化趋势及影响因素。同时分析苏州市辐射监测网络点位布设的合理性。基于连续5年γ空气吸收剂量率的特征分析得出主要研究结论有:1.部分监测点位布设不合理,应适当调整点位位置,增加布设点位数量。2.苏州市环境γ辐射空气吸收剂量率存在明显的地区差异,其数值受周边环境影响较大,与附近辐射污染源数量有关,数量越多、密度越大、活度越高则空气吸收剂量率越高。3.环境γ辐射空气吸收剂量与空气中相对湿度呈正相关;与环境氡浓度呈正相关;受降雨、寒潮因素影响明显,降雨量越大测得值越高,寒潮影响越大数值越高。4.累积γ辐射空气吸收剂量率呈现逐年缓慢增长的趋势。5.秦山、田湾核电站正常运行时对苏州市γ辐射空气吸收剂量率总体测量结果无影响。福岛事件发生后苏州市测得数据均低于江苏省天然辐射本底水平。
[Abstract]:Radiation exists in the natural environment, with the development of science and technology, 纬-ray has become a new technology is widely used in our daily life, and Suzhou is a big city of nuclear technology. The quantity and activity of radioactive sources are among the highest in Jiangsu Province and even in the whole country. After the accident of Fukushima nuclear power plant in Japan in March 11th 2011, the public paid more attention to the quality of radiation environment. The government also attaches great importance to the level of radiation environment of its own living environment. In order to grasp the status of radiation pollution sources and the quality of radiation environment in this city. Based on the analysis of the variation law of air ambient radiation level in our city, this paper studies the monitoring data of the overall system of 纬 -air ambient radiation in Suzhou City (2010-2014), and analyzes the five year instantaneous. Spatial distribution characteristics of continuous, cumulative 纬 -radiation absorbed dose rates in air. At the same time, the rationality of the location of radiation monitoring network in Suzhou is analyzed. Based on the characteristic analysis of 纬 -air absorption dose rate for 5 consecutive years, the main conclusions are as follows:. 1. Some monitoring points are unreasonable. It is necessary to adjust the position of the points and increase the number of the points. 2. There are obvious regional differences in the absorbed dose rates of 纬 -radiation air in Suzhou City, whose values are greatly affected by the surrounding environment. The higher the density and the higher the activity, the higher the absorbed dose rate of air. 3. There is a positive correlation between the absorbed dose of ambient 纬 radiation air and the relative humidity of the air. There was a positive correlation between radon concentration and environmental radon concentration. The higher the rainfall, the higher the measured value. 4. The cumulative 纬 -radiation air absorption dose rate shows a trend of slow increase year by year .5.Qinshan Mountain. When Tianwan Nuclear Power Station is in normal operation, it has no effect on the overall measurement results of radiation dose rate of 纬 radiation in Suzhou. After the Fukushima incident, the measured data in Suzhou are all lower than the level of natural radiation background in Jiangsu Province.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X837

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