某地戈壁与普通环境辐射剂量率对比及差异分析研究

摘要

利用NaI(Tl)便携式x-γ剂量率仪对西北某地戈壁砾石地带及普通环境地表的辐射剂量率进行对比测量,对可能的影响因素进行分析,并使用统计检验的方法分析测量结果,发现戈壁砾石地带结果高于普通环境,均值高约14.5%.基于实验室HPGeγ谱测量土壤样品及理论分析,得到导致此结果的原因主要是土壤中天然放射性核素含量及地表氡析出率的差异.结论提示需重视人员稀少地带的辐射环境水平,为中国在某些戈壁地区从事核技术利用开发项目的环境影响评价提供经验.%This study used NaI(Tl) portable X-γ dose rate monitor to measure the environmental radiation dose rate of the Gobi and normal environment as a contrast in a region in the northwest of China.It analyzed the possible factors, which could impact the results and made a statistical analysis, which indicated that the mean of Gobi is about 14.5% higher than that of the normal environment.Based on HPGe γ spectrum measurement of soil samples and theoretical analysis, the main reasons were the differences of natural radionuclide in soil and the radon exhalation.The conclusion showed that attentions should be paid to the radiation dose rate level in the environment of sparsely populated region.This article accumulates experiences for the environmental radiation impact assessment of some Gobi regions developed for nuclear technology applications.