An Ordo Reductor Thallax armed with a Rad-Cleanser

An Irradiation Projector, also known as a Rad-Cleanser or Irad-Cleanser, is a class of projected radiation devices used as potent anti-personnel weapons. These weapons were a relic from the Dark Age of Technology and were used exclusively by the forces of the Mechanicum, particularly during the Great Crusade and Horus Heresy eras of the late 30th and early 31st Millennia.

Any type of Irradiation Projector is commonly comprised of a bulky generator unit that terminates in a dish-like projector that unleashes a powerful blast of deadly cross-spectrum radiation. Any organic victims caught in the blast of such a weapon suffer an appalling death as they are boiled alive from within -- their tissues blasted apart on a cellular level by the potent ionising radiation. While thick barriers of solid matter between the beam and the target can provide some protection, victims who survive the initial blast will often die later of extreme radioactive contamination.

Types of Irradiation Projectors

The following are all known types of Irradiation Projectors that were once used by the ancient Mechanicum:


  • The Horus Heresy - Book One: Betrayal (Forge World Series) by Alan Bligh, pp. 232, 270
  • The Horus Heresy - Book Two: Massacre (Forge World Series) by Alan Bligh, pg. 273
  • The Horus Heresy - Book Three: Extermination (Forge World Series) by Alan Bligh, pg. 222
  • The Horus Heresy - Book Four: Conquest (Forge World Series) by Alan Bligh, pp. 246, 290
  • The Horus Heresy: Mechanicum - Taghmata Army List (Forge World Series) by Alan Bligh, pp. 26, 28, 39-40, 46, 55, 66-67, 75, 82, 108
  • The Horus Heresy: Crusade Imperialis - Army Lists (Forge World Series) by Alan Bligh, pp. 13, 58, 64, 107, 116
  • Imperial Armour Index: Forces of the Astra Militarum (8th Edition), pg. 100
  • Imperial Armour Index: Forces of Chaos (8th Edition), pg. 62
  • Forge World Webstore - Mechanicum Thallax Cohort with Irad Cleanser


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