全国γ辐射剂量率空间分布差异影响机理研究

发布时间：2018-03-06 03:31

本文选题：γ辐射剂量率　切入点：影响机理　出处：《地球信息科学学报》2017年05期 　论文类型：期刊论文

【摘要】：γ辐射剂量率的监测是天然放射性水平调查的重要部分,其关系到公众健康和辐射环境安全。目前中国环境γ辐射剂量率的空间分布水平的评价多基于专家经验知识,该方法不能够定量化表达γ辐射剂量率与环境因子的相互作用关系。为了进一步了解中国环境γ辐射剂量率的空间分布水平及影响其分布的机理,基于地理探测器提出了定量表达γ辐射剂量率与环境因子的相互作用关系的方法。本文首先收集了2015年全国辐射环境自动监测站的空气吸收剂量率的数据,并计算了44个地级市的年均值作为被解释变量;然后探索性分析了44个地级市的γ辐射剂量率的空间分布的规律;最后结合环境要素指标,借助地理探测器方法揭示了全国辐射剂量率的空间分布影响机理。研究发现:(1)低值沿着中国黑河至南宁的沿线缓冲带分布,高值在该缓冲带两侧扩散。(2)环境要素中解释力由高到底排序为:海拔高程(0.846)气候带(0.741)植被覆盖(0.691)土地利用分类(0.427)生态系统(0.419)地形(0.101)。海拔高程一方面通过表观地球营力与地质构造,从而影响着地壳中天然辐射水平;另一方面对通过对自然环境的分布情况的影响,决定着人类生产活动的分布,进而作用到人工电离辐射源。因此影响γ辐射剂量率的空间分布的主要环境因子是综合了自然要素与人文经济活动的海拔高程。
[Abstract]:The monitoring of 纬 radiation dose rate is an important part of natural radiation level investigation, which is related to public health and radiation environmental safety. At present, the evaluation of the spatial distribution level of 纬 radiation dose rate in China is based on expert experience and knowledge. This method can not quantitatively express the interaction between 纬 -radiation dose rate and environmental factors. In order to further understand the spatial distribution level of environmental 纬 -radiation dose rate in China and the mechanism affecting its distribution, Based on the geographical detector, a quantitative expression method of the interaction between 纬 radiation dose rate and environmental factors is proposed. In this paper, the data of air absorbed dose rate of the national automatic monitoring station for radiation environment in 2015 are collected. The annual mean value of 44 prefecture-level cities is calculated as the explained variable, and then the spatial distribution of 纬 radiation dose rate in 44 prefecture-level cities is analyzed. The mechanism of spatial distribution of radiation dose rate in China is revealed by means of geographical detector method. It is found that the low value of the radiation dose rate distributes along the buffer zone from Heihe River to Nanning, China. The interpretation of the high value in the environmental elements on both sides of the buffer zone is: altitude elevation 0.846) climate belt 0.741) vegetation cover 0.691) land use classification (0.427) ecosystem (0.419) topography 0.101g. elevation on the one hand the earth is observed by the surface of the earth on the other hand, the land use classification is 0.427) the land use classification is 0.427) and the ecosystem is 0.419). Camp and geological structure, This affects the level of natural radiation in the crust; on the other hand, it determines the distribution of human production through the distribution of the natural environment. Therefore, the main environmental factor affecting the spatial distribution of 纬 radiation dose rate is the elevation of the natural elements and the humanistic economic activities.
【作者单位】：中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室;中国科学院大学;江苏省地理信息资源开发与利用协同创新中心;中国科学院科技战略咨询研究院;环境保护部核与辐射安全中心;
【基金】：国家自然科学基金项目“复杂区域多目标总体估计空间抽样优化研究”(41301425);“基于“三位一体”空间抽样理论研究及其二联查找表研建”(41531179)
【分类号】：R144

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