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氦和氡都是放射性元素衰变产生的惰性气体,当地下水和地表水流经铀矿体及其原生晕时,相互接触作用,使铀转入到水溶液中。在地下水的流动、渗滤及扩散等作用下,铀矿体附近便会形成氦和氡的水化学晕。这种水化异常的形状,主要和地下水的流动方向有关。而晕的范围大小,则决定于地下水的流速、构造裂隙及被测元素的地球化学性质等。选择理想的指示元素,不仅能减少野外工作量,并能更明显地圈定矿异常。
Both helium and radon are inert gases produced by the decay of radioactive elements. When local groundwater and surface water flow through the uranium ore body and its primary halo, they interact with each other to transfer uranium into the aqueous solution. Under the action of groundwater flow, percolation and diffusion, hydrated halo of helium and radon will form near the uranium ore body. This abnormal shape of hydration, mainly related to the direction of groundwater flow. The size of the halo depends on the flow rate of groundwater, structural fractures and the geochemistry of the element under test. Choosing the ideal indicator element will not only reduce the field workload but also define the mine anomaly more clearly.