From The Vault
Rad Resistance is a Fallout, Fallout 2, Fallout 3 and Fallout Tactics Perk.
[edit] Fallout, Fallout 2 and Fallout Tactics
You are better able to avoid radiation, and the bad effects radiation causes. Each level of this Perk will improve your Radiation Resistance by 15%. The Fallout manual erroneously states that it increases rad resistance by only 10%.
In Fallout there simply aren't enough radiation-heavy areas for this perk to be of value; better to carry some RadX and RadAway for those areas.
[edit] Fallout 3
Rad Resistance allows you to -- what else? -- resist radiation. This perk grants an additional 25% to Radiation Resistance.
This stacks with Rad-X.
The necessity of this perk is questionable as the perks gained from The Pitt will grant 13% radiation resistance in total, the Cyborg perk will add 10% more as well as providing other useful effects and at the same time, each point in Endurance also nets a natural resistance of 2% . All power armors (not including Tribal Power Armor and Ashur's Power Armor) increases radiation resistance as well (ranging from 10 to 25%). Even if the player should encounter heavy doses of radiation, Rad-X and Rad Away is of no shortage, as well an Advanced Radiation Suit can be obtained. Without this perk, it is still incredibly easy to reach the 85% max resistance .
