Radiation Resistance

Radiation Resistance is a derived statistic in Fallout, Fallout 2, Fallout 3 and Fallout Tactics: Brotherhood of Steel.

The amount of radiation you are exposed to is reduced by this percentage. Radiation Resistance can be modified by the type of armor worn and anti-radiation chems. Rad-X temporarily increases Radiation Resistance.

Initial Level: Starting radiation resistance is equal to EN x 2. Average characters will have a 10% radiation resistance.


 * The Fast Metabolism trait sets initial radiation resistance to 0.
 * The Rad Resistance perk increases radiation resistance by 15% per rank. (10% per rank in FO1)
 * The Vault City Inoculations perk increases radiation resistance by 10%.

Fallout 3
Permanently increasing Radiation Resistance
 * Each point of Endurance increases your Radiation Resistance.
 * The Cyborg perk gives +10% Radiation Resistance.
 * The Rad Resistance perk gives +25% Radiation resistance.
 * The Survivor perk gives up to +6% Radiation resistance.

Temporary increasing Radiation Resistance
 * The Rad-X drug gives up to +75% Radiation resistance with the Medicine skill at 100.

The maximum amount of resistance you can gain from perks and Endurance in Fallout 3 is 59% in total. You can increase this up to a maximum of 85% with items or drugs.

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