About the sample | The Radium sample is not real sample of radium. In this case we made a compromise. This sample is a set of watch dials painted with luminous paint containing radium-226 to produce radioluminescence. They glow in the dark because they contain a mixture of zinc sulfide and some 226Ra salt. Radium salt is radioactive emitting alpha, beta, and gamma radiation. Radium dials were replaced by safer tritium-based luminous material in the 1970s and later, from the middle 1990s, non-toxic, non-radioactive strontium aluminate–based photoluminescent material were used. This sample is a part of the private collection of Metodija Najdoski. It is a gift from a friend, Michael Ben Raphael, the owner of the company The Periodic Element Guys, that sells chemical elements samples.. |
| Z | 88 |
| ρ / g/cm3 | 5.0 |
| tt, mp / °C | 700 |
| tv, bp / °C | 1737 |
| Ar | 226 |
| Electronegativity, (X) | 0.9 |
| Crystal structure | Cubic |
| Extended information | https://www.webelements.com/radium/ |