plutonium trigger

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Noun1.plutonium trigger - a steel or beryllium sphere containing plutonium 239 that triggers nuclear fission when compressed by explosives
A-bomb, atom bomb, atomic bomb, fission bomb, plutonium bomb - a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239)
trigger - a device that activates or releases or causes something to happen
References in periodicals archive ?
Kristen Iversen was raised near the Rocky Flats facility in Colorado, at a time when few workers at the plutonium trigger plant knew exactly what it produced.
The Department of Energy (DOE) still controls the 1,308-acre fenced-off middle--technically the "central operable unit"--encompassing the former site of the country's only manufacturing facility for plutonium triggers for nuclear weapons.
For about 40 years, the Department of Energy's Rocky Flats site, near Denver, served as a production facility that made plutonium triggers, or "pits," for nuclear weapons.