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Nuclear weapon design
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===Chain safety method=== Alternatively, the pit can be "safed" by having its normally hollow core filled with an inert material such as a fine metal chain, possibly made of [[cadmium]] to absorb neutrons. While the chain is in the center of the pit, the pit cannot be compressed into an appropriate shape to fission; when the weapon is to be armed, the chain is removed. Similarly, although a serious fire could detonate the explosives, destroying the pit and spreading plutonium to contaminate the surroundings as has happened in [[list of military nuclear accidents|several weapons accidents]], it could not cause a nuclear explosion.{{Citation needed|date=June 2021}}
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