The Vault - Fallout Wiki

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The Vault - Fallout Wiki
Old World Blues
RequirementsLevel 20, Endurance 6
EffectsRun speed and attack speed x1.25, +2 STR, +2 DT with > 0 radiation level, bonus to AP regeneration while being irradiated
base idxx008011
Gametitle-FNV OWB.png
Gametitle-FNV OWB.png

With the Atomic! perk, you are 25% faster and stronger whenever you're basking in the warm glow of radiation. Outside irradiated areas, your Action Points (AP) regenerate faster and faster the higher your level of radiation sickness becomes.

Fallout: New Vegas description

Atomic! is a perk in the Fallout: New Vegas add-on Old World Blues.


When in irradiated zones, run speed is multiplied by 1.25, which is good for getting out of hot zones quickly. Additionally, both Strength and Damage Threshold are raised by 2 while in the radiation.

While irradiated, Action Points regenerate faster depending on the extent of your radiation exposure. If irradiated with 200-400 rads, AP regeneration is x1.1; 400-600, AP regeneration is x1.2; 600-800, AP regeneration is x1.33; and 800-999, AP regeneration is x1.5


  • Synergizes well with Rad Child, Nerves of Steel, Travel Light, Fast Shot and Slayer.
  • When eating foods that have a Rad effect longer than one second (such as coyote meat), the Atomic! perk will activate. Eating multiple coyote steaks will stack the Rads duration, giving the player a lengthy speed boost if many are consumed.
    • The speed boost applies to fast traveling as well, stacking the perk with Travel Light results in significantly reduced hunger, thirst and elapsed time when fast traveling under and over carry weight (Long Haul). For this reason eating irradiated foods with an effect longer than one second, or using player housing with continuous rads outside the door (Hell's Motel) can be beneficial.