巴中市室外γ辐射水平调查及其相关因素分析

目的 了解巴中市室外γ辐射剂量水平，探索室外地表γ辐射剂量率相关因素。方法 按照《环境地表γ辐射剂量率测定规范》（GB/T14583—1993）布点和检测，使用RStudio 1.2.5033软件进行统计分析，多组均数的比较使用单因素方差分析，相关因素分析使用多重线性回归。结果 本次调查对巴中市辖区432个点的室外地表γ辐射剂量率进行巡测。巴中市室外地表γ辐射剂量率均值为113.04nGy/h，室外天然γ辐射所致居民人均年有效剂量当量为0.14mSv。不同县区、不同地点类型室外地表γ辐射剂量率分析结果显示巴州区（120.72nGy/h）、平昌县（119.65nGy/h）和通江县（121.45nGy/h）地表γ辐射剂量率均值高于南江县（98.08nGy/h）和恩阳区（103.74nGy/h），一般道路γ辐射剂量率均值（115.57nGy/h）大于荒地（109.98nGy/h）。多重线性回归结果显示室外地表γ辐射剂量率可能的相关因素有县区和道路类型。结论 巴中市室外地表γ辐射属于正常本底水平。

Investigation of outdoor terrestrial gamma radiation level and correlation factors,Bazhong

To have a preliminary understanding of the outdoor terrestrial gamma-radiation dosage levels in Bazhong, and to explore the related factors of the outdoor terrestrial gamma-radiation dose rate. Methods The sampling plan and the gauging of the terrestrial gamma-radiation dose were based on the Norm for the measurement of environmental terrestrial gamma-radiation dose rate(GB/T14583—1993). RStudio 1.2.5033 was used for statistical analysis, one-way ANOVA for the comparison of the mean of multiple groups, and multiple linear regression for correlation factors analysis. Results The outdoor terrestrial gamma-radiation rates of 432 sites in Bazhong were monitored. The mean of outdoor terrestrial gamma-radiation rate in Bazhong was 113.04 nGy/h and the annual effective dose per capita due to outdoor gamma radiation was 0.14 mSv. The analysis of different counties and different road types showed that the average outdoor terrestrial gamma radiation rates of Bazhou District(120.72 nGy/h) Pingchang County(119.65 nGy/h) and Tongjiang County(121.45 nGy/h) were higher than those in Nanjiang County(98.08 nGy/h) and Enyang District(103.74 nGy/h). The average outdoor terrestrial gamma radiation rate of the ordinary road(115.57 nGy/h) was higher than that of the uncultivated land(109.98 nGy/h). Moreover, the multiple linear regression result showed that the possible correlation factors of terrestrial gamma-radiation dose rate were counties and road types. Conclusion The outdoor gamma-radiation in Bazhong was normal background level.