The sleek lines of the Detron conceal it's[sic] ferocious nature. The hand cannon's semi-automatic action takes down enemies with speed and efficiency.
The Detron was one of two rewards for The Gradivus Dilemma event, the other being the Brakk. While it was not awarded from the event, as the Corpus lost the conflict, its blueprint and components are now dropped by the Harvester.
The Detron is used by grey-suited Corpus Crewmen who are only encountered on the Corpus Gas City tileset. When used by these crewmen, it behaves like a shotgun, firing a spray of blue energy bolt projectiles.
This particular damage combination is also effective against Ancient Infested (as the Corrosive and Blast Damage will make short work of Disrupters and Toxics, while the Radiation Damage will do more damage to Healers).
The fact is, Radiation Damage can still be used effectively for any faction with the Damage possibilities making a perfect sidearm for the Void or any extended game where that ammo count will be needed to able to take down heavy units easily with no trouble. Also, adding Corrosive damage will balance the weapon for Void missions causing it have no damage type loss for any Enemy - besides shields for Drones and Moas.
Colloquially, a "hand cannon" often refers to an extremely powerful pistol chambered for a high caliber cartridge such as .500 S&W Magnum or .50 Action Express.
In Livestream 17, the developers jokingly claimed that the Detron pistols intended as rewards for the Gradivus Dilemma were "melted down and used to make MOAs." This has more or less proven to be true, as the Harvester drops the Detron blueprint and parts.
Like the Flux Rifle , the Detron does not follow the Corpus weapon naming convention.
During the reload animation, A pack of 6 energy cells (presumably) is ejected from the gun, although, the Detron only has the capability of firing 5 rounds before reloading.