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From The Vault - Fallout Wiki
You are better able to avoid radiation, and the bad effects radiation causes. Each level of this Perk will improve your Radiation Resistance by 10%.
”— Fallout description
You are better able to avoid radiation and the bad effects radiation causes. Each level of this Perk improves your Radiation Resistance by 15%.
”— Fallout 2 description
Rad Resistance is a perk in Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, Fallout 4, and Fallout Tactics.
Fallout, Fallout 2 and Fallout Tactics[edit | edit source]
+15% to radiation resistance (+45% with three ranks). Functionally useless, as radiation is not a concern, with only the Glow posing a problem (which can be rectified with two doses of Rad-X).
Fallout 3 and Fallout: New Vegas[edit | edit source]
+25% to radiation resistance. The perk is functionally useless, as it is trivially easy to temporarily boost radiation resistance to the maximum with Rad-X, various radiation-resistant armor and other perks with more benefits, and a general absence of heavily irradiated areas.
- Rank 1: +10 radiation resistance
- Rank 2: +20 radiation resistance
- Rank 3: +30 radiation resistance
- Rank 4: +40 radiation resistance
Actually useful, due to the way radiation reduces the maximum health. However, it's more comfortable to avoid irradiation in the first place.