decay factor; decay coefficient; attenuation constant
balance of radium and uranium
balance of uranium and radium
distal end fracture of radium
Limit infinitesimal radium
milligram radium equivalent
Radium
镭
镭系
镭源
桡骨
探测半径
镭龄
镭铅
镭年积
碳酸镭
溴化镭
镭族
镭度盘
镭囊
镭精制厂
镭弹
镭标准
镭射气
镭盐
钍
镭绸
镭防护
radium and radon equilibrium coefficient