Radium is not used to produce energy.
Your question is meaningless. Radium IS a radioactive element, and its power depends on the context. If you mean "is there an element more radioactive than radium" then yes, there are many, e.g. astatine.
Dust of the radioactive element Radium.
Radon and radium are radioactive.
Radium is an element; it has no sub-parts. Radium is a radioactive element, so it will slowly and spontaneously decay into other elements.
Radium is a radioactive chemical element, very dangerous, an alpha radiations emitter; radium is also a source of radon, by decay - radon (gas) is also a radioactive element.
Radium
Radium (Ra) atomic number 88
The radioactive artificial element curium (Cm).
Radium is a radioactive chemical element, very dangerous, an alpha radiations emitter; radium is also a source of radon, by decay - also radioactive and dangerous gas.
The artificial radioactive element curium (Cm).
the main element extracted was radium
Radium is a very dangerous radioactive element.