Samian isotop radium sanget radioaktip, antuk isotop pinih tegteg punika radium-226, sané ngelah paruh kala 1600 warsa miwah ngaluruh dados gas radon (kusus nyané isotop radon-222).
All isotopes of radium are highly radioactive, with the most stable isotope being radium-226, which has a half-life of 1600 years and decays into radon gas.