U.S. Geological Survey, Wyoming/Montana Water Science Center, Helena, MT, USA.
U.S. Geological Survey, Colorado Water Science Center, Denver, CO, USA.
J Environ Radioact. 2020 Sep;220-221:106266. doi: 10.1016/j.jenvrad.2020.106266. Epub 2020 May 18.
Radon (Rn) was monitored in open air in publicly accessible areas surrounding the Pinenut uranium (U) mine during mining and reclamation activities in 2015-16 to address concerns about mining related effects to areas surrounding Grand Canyon National Park (GCNP) in Arizona, USA. During July 2015, Rn concentrations associated with the ore storage pile monitoring site were larger than those at the mine vent monitoring site and likely resulted from the relatively large amount of ore stored on site during this period. Higher wind velocities at the ore pile monitoring site generally resulted in lower Rn concentrations; however, wind velocity did not appear to be an important factor in controlling Rn concentrations at the mine vent monitoring site. Physical disturbances of the ore pile by heavy equipment did not coincide with elevated Rn concentrations at the ore storage pile or mine vent monitoring sites. The relative size of the ore storage pile showed a positive trend with the daily mean Rn concentration measured at the ore pile monitoring site. Principal component analysis (PCA) was applied to the ore pile and mine vent multivariate data sets for simultaneous comparison of all measured variables during 230 days of the study period. A significant positive coefficient for Rn was associated with a significant negative coefficient for wind speed for principal component (PC) 2. Significant, positive PC2 coefficients included Rn, wind direction, and relative ore pile size indicating that Rn variations at the mine vent monitoring site may be affected by Rn sourced from the ore pile. The ore pile is located about 200 m south of the mine vent Rn monitor with the prevalent wind direction coming from the south. All data generated during the field study and laboratory verification tests were published by Naftz et al. (2018) and are available online at: https://doi.org/10.5066/F79Z946T.
2015-16 年，在皮纳特铀矿（美国亚利桑那州大峡谷国家公园附近）的开采和复垦活动期间，监测了公共可进入区域空气中的氡（Rn），以解决与矿区相关的对周围地区的影响的担忧。2015 年 7 月，与矿石储存堆监测点相关的 Rn 浓度大于通风口监测点的浓度，这可能是由于在此期间在现场储存了大量矿石。矿石堆监测点的较高风速通常会导致较低的 Rn 浓度；然而，风速似乎不是控制通风口监测点 Rn 浓度的重要因素。重型设备对矿石堆的物理干扰并没有与矿石储存堆或通风口监测点的 Rn 浓度升高同时发生。矿石堆的相对大小与矿石堆监测点的日平均 Rn 浓度呈正相关趋势。主成分分析（PCA）应用于矿石堆和通风口多变量数据集，用于同时比较研究期间 230 天内所有测量变量。对于主成分（PC）2，Rn 与风速的显著正系数相关，这与风速的显著负系数相关。显著的正 PC2 系数包括 Rn、风向和相对矿石堆大小，表明通风口监测点的 Rn 变化可能受到矿石堆中 Rn 的影响。矿石堆位于通风口 Rn 监测器以南约 200 米处，盛行风向来自南方。野外研究和实验室验证测试期间生成的所有数据均由 Naftz 等人发表（2018 年），并可在以下网址获得：https://doi.org/10.5066/F79Z946T.
