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 ?
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.
There would be no planning to build a new factory--possibly in New Mexico--to produce plutonium triggers by the hundreds annually to support a US arsenal of thousands of nuclear bombs.