| Radon is present in the atmosphere because it is constantly being formed during the radioactive decay of uranium and radium. |
| Radon is produced when trace amounts of uranium and radium in the soil or rocks decay. |
| Initial autopsies showed high amounts of radium and cesium in four deer livers. |
| Rutherford was studying the structure of matter by bombarding a very thin gold foil with the alpha radiation from radium and polonium. |
| The Curies discovered radium, a radioactive substance, in uranium oxide ore. |
| I loved to hold its face close to mine in the dark and watch the scintillations produced every time a radium nucleus decayed. |
