![]() ![]() The free neutrons cause additional fission reactions, which creates more pressure on the lithium deuteride, producing more fusion reactions. The tritium then fuses with the deuterium to form helium (nuclear fusion) and more neutrons. The heat and pressure from the explosion cause the “fuel” (lithium deuteride) surrounding the sparkplug to react, releasing tritium. Next, a “sparkplug,” usually made entirely of fissionable material, compresses and fissions, releasing outward explosive energy. The outside of the casing contains a uranium tamper, meant to absorb some of the x rays to prevent an early reaction within the core. The polystyrene foam that fills the inside of the devices’ containment shell then melts into a plasma, and begins compressing the cylindrical casing. The primary fission explosion produces high energy gamma and x-rays, which are channeled downward, and reflected toward the fusion device. A compound known as lithium deuteride, which is created by combining lithium and deuterium, is used as the fuel in modern thermonuclear weapons. When fused, the extra neutrons within the nuclei of these isotopes are released in the form of energy.
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