Polonium
From Tardis Wiki, the free Doctor Who reference
Polonium was an element on the periodic table with the symbol Po (TV: Shada [+]Loading...["Shada (TV story)"]) and atomic number 84. It was the most radioactive element. (PROSE: The Grail [+]Loading...["The Grail (novel)"])
Señor 105 had a polonium mask. (PROSE: The Grail [+]Loading...["The Grail (novel)"])
Polonium-210 was an isotope of polonium. (PROSE: The Eight Truths [+]Loading...["The Eight Truths (audio story)"])
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