Caesium
From Tardis Wiki, the free Doctor Who reference
Caesium was an element with the symbol Cs (TV: Shada) and atomic number 55. (TV: Flatline)
Secondary electrode accelerators in ion jet rockets beat the problem of neutral caesium ions. (TV: The Seeds of Death)
Inside a miniscope, the Third Doctor oberved an early pulse mechanism based on the principle of caesium decay. He considered it "vintage stuff". (TV: Carnival of Monsters)
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