When a reactor core is shut down, its energy output drops not to zero, but about 6% of its normal output, Forsberg told me. The reactions grind to a halt over the next few days, as the falling Jenga towers run out of other towers they can actually hit. In the meantime, atoms keep breaking apart, releasing both heat and fast-moving particles that can penetrate human skin and damage our cells. Because of this, every nuclear reactor has ways of getting rid of the heat, and blocking those fast-moving radioactive particles。

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