Radiation Resistance

 is a derived statistic in Fallout, Fallout 2, Fallout 3, Fallout Tactics and Fallout: New Vegas.

Rad-X temporarily increases Radiation Resistance.

Fallout, Fallout 2, Fallout Tactics, Fallout: New Vegas

 * $$\text{Initial level}=\text{Endurance}\times2$$

Notes:
 * 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%.
 * Rad-X temporarily increases radiation resistance by 50%. Half of it is lost after 24 hours, with resistance returning to its original value after another 24 hours.
 * In Fallout, rad resistance can go as high as 100% (Which is needed to survive The Glow). In Fallout 2, it is capped at 95%, in Fallout: New Vegas, however it is capped at 85%.

Fallout 3

 * $$\text{Initial level }%=(\text{Endurance}-1)\times2$$

Example: A starting Endurance of 5.


 * $$(5-1)\times2=8\%$$

Permanently increasing Radiation Resistance

 * The Cyborg perk gives +10% Radiation Resistance.
 * The Rad Resistance perk gives +25% Radiation resistance.
 * The Survival Expert perk gives between +2% and +6% Radiation resistance.
 * The Pitt Fighter perk from The Pitt gives +3% Radiation Resistance.
 * The Booster Shot perk from The Pitt gives +10% Radiation Resistance.

Temporarily increasing Radiation Resistance

 * The Rad-X drug gives up to +75% Radiation resistance with the Medicine skill at 100.
 * An advanced radiation suit, the environment suit, Lesko's lab coat, Filtration helmet, a radiation suit and the modified utility jumpsuit will all increase Radiation Resistance while worn.
 * All power armor has some Radiation Resistance.

Notes:
 * In Fallout 3 rad resistance is capped at 85%.

Gallery
Odporność na promieniowanie Сопротивляемость радиации