ماهي المادة المشعة المستعملة في الصاروخ النووي ؟
When a free neutron hits the nucleus of a fissile atom like uranium-235 (<sup>235</sup>U), the uranium nucleus splits into two smaller nuclei called fission fragments, plus more neutrons. Fission can be self-sustaining because it produces more neutrons of the speed required to cause new fissions.
uranium-235