Middle of Crater of Atom: Radiation Resistance River near Sanctuary: Radiation Resistance Expect different behavior inside Horizon though. These tables are copied from as a rough estimate. 📝 Note: Radiation damage in Horizon has been tweaked. Higher or lower resistance relative to the radiation level modifies the percent of damage one takes, but the effects diminish on both sides even 5 rad resistance will significantly mitigate low-level radiation, but rads will still seep through the toughest of power armor. If one goes swimming ('X' rads/s in water) with a Rad Resistance of 'X', they will only take 'X/2' rads/s. The basic principle is that if one's rads/second is exactly equal to their Rad Resistance, they will take half damage. Power armor can provide over 1,000 rad resistance this helps significantly but still does not make one completely immune to radiation. Rad Resistance does not work in percentage terms as in earlier games.

NEW: 'Radiation Poisoning' similiar to standard poison, it puts a debuff on you and may add rads over time.

Filling bottles at any water source (including water pumps) now gives dirty water.

All drinkable water sources now cause some radiation damage and are considered dirty water (which is everything except Purified Water bottles).

Food and water that cause radiation damage now cause more radiation damage.

RadAway takes a few extra ingredients to craft it.

The price for curing radiation from doctors is increased, and scales based on the exact amount of rads you need cured.

The price for buying Radaway is greatly increased.RadAway no longer benefits from Chemist or BioComm mods (this should never have been like this to begin with).RadAway also no longer causes starvation (again, this is a pointless annoyance to the player.RadAway, drugs, and alcohol, no longer dehydrates the player (since I've made curing rads harder now, there's no need to penalize the player with annoyances like this).RadAway can still be increased by the Medic Perk, but the amount is reduced rebalanced.RadAway cures half the amount of rads now, but the immunity debuff is reduced to 20 minutes.

RadAway will rarely drop from loot or containers, but continues to exist in static locations.You will find yourself needing a real doctor or valuable items to cure yourself of any sizable radiation damage. 📝 Note: Radiation should be something to be avoided if possible. Radiation effects and counter-measures has been largely changed in Horizon.

Fallout 4 how to reduce radiation