<page_title> List of fictional elements, materials, isotopes and subatomic particles </page_title> <section_title> Fictional elements and materials </section_title> <table> <cell> Radium X <col_header> Name </col_header> </cell> <cell> The Invisible Ray <col_header> Source </col_header> </cell> <cell> Radium X was an intensively radioactive extraterrestrial element discovered by Dr. Janos Rukh (Boris Karloff) in the 1936 film The Invisible Ray. <col_header> Uses </col_header> </cell> </table>
Janos Rukh discovered "Radium X" in The Invisible Ray in 1936.