How is radon produced from radium?

Radon is produced from radium through the process of radioactive decay. Specifically, radium-226, which is a member of the uranium-decay series, undergoes decay to form its daughter isotope, radon-222.12

Because all isotopes of radium are radioactive, this decay process serves as the primary natural source of radon. In laboratory or medical settings, concentrated samples of radon are prepared by keeping a supply of radium in a vessel—either in an aqueous solution or as a porous solid—from which the resulting radon gas can be periodically pumped off, purified, and collected.12

It is important to note that because radon is a radioactive gas and its decay products can pose serious health risks, such as an increased likelihood of lung cancer when inhaled, the handling and management of these materials must be conducted with strict adherence to safety and ethical standards to protect human health.2