Radium-226

²²⁶Ra is the most stable isotope of radium and is the last isotope in the (4n + 2) decay chain of uranium-238 with a half-life of over a millennium: it makes up almost all of natural radium. Its immediate decay product is the dense radioactive noble gas radon (specifically the isotope ²²²Rn), which is responsible for much of the danger of environmental radium. It is 2.7 million times more radioactive than the same molar amount of natural uranium (mostly uranium-238), due to its proportionally shorter half-life.

Spectrum (Fullscreen)

5 minute measurement with a High Purity Germanium (HPGe) radiation detector.

Metadata

Isotope:	Radium
Mass number:	226
Atomic number:	88
Neutron number:	138
…	…

Sources and Further Read

• https://en.wikipedia.org/wiki/Isotopes_of_radium