Antimatter charge

The Antimatter Charge is a powerful explosive weapon used by the Covenant.

They use antimatter charges in a variety of ways, such as to create an opening in ship armor during boarding action, or as an anti-vehicle and anti-personnel weapon. These appear to be the choice and trademark explosives of Ranger Elite teams or boarding parties, as they have sometimes been used to destroy Magnetic Accelerator Cannons aboard ship-to-ship engagements.

Any contact between antimatter and normal matter causes a complete conversion of mass to energy, causing a release of electromagnetic radiation.

Only one kilogram of antimatter reacting with one kilogram of matter would yield an explosion of 42.96 megatons, which is almost equivalent to three thousand Hiroshima-bombs (45 Mt combined). An antimatter-matter explosion is the most efficient way of liberating energy, with a 100% yield in the form of radiation.

Trivia

 * An antimatter particle, colliding with a matter particle releases an intact 100% of the energy contained within the particles, while an H-bomb (Hydrogen bomb) only releases about 7% of this energy. This gives a clue to how effective and powerful this force really is.
 * Jen Taylor, as Cortana, had trouble recording the Halo: Combat Evolved line, "It must have been one of their boarding parties, I'd suggest an antimatter charge!", joking that "It sounds so weird!".

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 * Covenant Bomb