the remaining steps necessary

U.S. estimates concerning Iranian nuclear weapon development account for the time necessary to produce a sufficient amount of weapons-grade HEU and also complete the remaining steps necessary for an implosion-style nuclear device suitable for explosive testing. Such a device, according to the Office of Technology Assessment, uses “a shell of chemical high-explosive surrounding the nuclear material … to rapidly and uniformly compress the nuclear material to form a supercritical mass” necessary for a sustained nuclear chain reaction. หนังใหม่2025