From Halopedia, the Halo wiki
Plutonium is a radioactive transuranic element. It is used in nuclear weapons. When stored aboard interstellar spacecraft, the plutonium in nuclear weapons generates a Cherenkov radiation aura upon exiting Slipspace that negates stealth measures,[1] forcing stealth vessels to jettison any nukes aboard if a stealthed slipspace exit is necessary.[2] List of appearances[edit]
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