radium D镭Dradiumn.[化]镭（元素符号Ra）radium investigation depth径向探测深度radium-plaque adaptomete蕾板适应计radium-plate adaptometer镭板适应计radium-type vacuum gauge放射真空计radium sonde for esophagus食道用镭探条radium-plaque adaptometer镭板适应计radium irradiation equipment镭辐射设备radium for scientific purposes科学用镭Radium is a chemical element.镭是一种化学元素。Radium tubes for medical purposes医用镭管