Polonium the Curies while they were investigating the cause of pitchblende radioactivity. Pitchblende, after removal of the radioactive elements uranium and thorium, was more radioactive than the uranium and thorium combined. This spurred the Curies to search for additional radioactive elements. They first separated out polonium from pitchblende in July 1898, and five months later, also isolated radium. German scientist Willy Marckwald successfully isolated 3 milligrams of polonium in 1902, though at the time he believed it was a new element, which he dubbed "radio-tellurium", and it was not until 1905 that it was demonstrated to be the same as polonium.
The Apocalypse Element galaxy. The Apocalypse Element The Apocalypse Element is a Big Finish Productions audio drama based on the long-running British science fiction television series "Doctor Who". It forms the second serial in the Dalek Empire arc, following on from events in "The Genocide Machine". The arc continues in "The Mutant Phase" and concludes in "The Time of the Daleks". At a conference on Archetryx between major temporal powers, the Sixth Doctor and Evelyn discover that Romana has been missing for twenty years and that the Daleks' newest weapon — the Apocalypse Element — threatens not only the Time Lords but the