Aside from the geopolitical warning signs, your first warnings of an imminent nuclear attack will most likely be an alarm or warning signal if not, it will be the blast itself. The bulk of the US and Russian strategic arsenal are these types of bombs. Fusion weapons are also known as thermonuclear weapons since high temperatures are required to fuse deuterium and tritium such weapons are usually many hundreds of times more powerful than the bombs that destroyed Nagasaki and Hiroshima. Fusion (H-Bombs), using the incredible heat of a fission bomb 'spark plug', compress and heat deuterium and tritium (isotopes of hydrogen) which fuse, releasing immense amounts of energy.This is the most likely type of bomb to be used by terrorists. Fission bombs are the only type of nuclear bomb used in war so far. The daughter neutrons cause an extremely fast nuclear chain reaction. This bomb's power comes from splitting heavy nuclei (plutonium and uranium) with neutrons as the uranium or plutonium split each atom releases great amounts of energy - and more neutrons. Fission (A-Bombs) are the most basic nuclear weapon and are incorporated into the other weapon classes.Learn about the different types of nuclear weapons.:

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