| A proposal was patented for a ceramic block pessary using radioactive elements such as thorium, actinium and even radium. |
| The University of Southampton used mass spectrometry to probe samples for plutonium, radium and caesium. |
| 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. |
| There is radon gas in uranium mines because the disintegration of uranium leads to radium, which then forms radon as shown in the equation above. |
| Among the commonly known alpha emitters are various isotopes of polonium, radium, thorium, uranium and all of the transuranium elements. |
