Antimatter charge

The Antimatter Charge is an explosive weapon used by the Covenant

They use antimatter charges in a variety of ways, such as to blow through ship armor during boarding action, or as anti-vehicle and anti-personnel weapons. These appear to be the choice explosive of Ranger Elite teams, as they have sometimes been used to destroy Magnetic Accelerator Cannons aboard ships.

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 100% of the energy contained within the particles, while an H-bomb only releases about 7% of this energy. This gives a clue to how effective and powerful this force is.
 * Jen Taylor, as Cortana, had trouble recording the Halo CE 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
 * Covenant Bomb