fissile core

基本解释

They compress the fissile core, or pit, of the warhead until it reaches critical mass.
該技術可以將裂變核心或者彈芯壓縮至臨界質量。
plutonium can be extracted from nuclear wastes and expensively reused in special sorts of fuel, but it can also be fashioned into the fissile core of a weapon.
鈈可以從核廢料提取，竝可作爲某種昂貴燃料重新加以利用。然而鈈也可以加工成武器中用於核裂變的核心部件。
Yet it is openly working on missiles that could deliver one and on the techniques that could produce sufficiently enriched uranium or else plutonium for a weapon’s fissile core.
但是伊朗公開研制可以運載核爆的導彈，從技術上來講，伊朗能夠生産出足夠多的濃縮鈾或者鈈來完成武器所需的核裂變。

Uranium enrichment is a process which makes nuclear fuel but can also be diverted to produce the fissile core of atomic bombs.
CENTERFORSECURITYPOLICY: Tehran threat in the US' backyard
Yet it is openly working on missiles that could deliver one and on the techniques that could produce sufficiently enriched uranium or else plutonium for a weapon's fissile core.
ECONOMIST: Proliferation from North Korea and Iran