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The Bruce Murray Space Image Library

Plutonium-238 Fuel Pellet

Plutonium-238 Fuel Pellet

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Department of Energy

Plutonium-238 Fuel Pellet
A ceramic fuel pellet of Plutonium-238 oxide glows orange from its radioactive decay. These pellets are used inside Radioisotope Thermoelectric Generators (RTGs) to provide heat that is converted into electricity on spacecraft.

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