The optimal selection of uranium tailings sand cover materials is of great significance to the management of tailings sand in uranium mines.By constructing a radon concentration distribution model for uranium tailings sand cover layer,using single-layer and three-layer ...MORE The optimal selection of uranium tailings sand cover materials is of great significance to the management of tailings sand in uranium mines.By constructing a radon concentration distribution model for uranium tailings sand cover layer,using single-layer and three-layer cover materials,constructing a multi-objective decis...