Radiation resistance

	Derived statistic Radiation resistance
	Fallout, Fallout 2, Fallout Tactics, Fallout: New Vegas Modifies Reduction of radiation exposure Governed By Endurance, armor, Rad-X Initial Value Endurance * 2 Related Perks Rad Resistance, Vault City Inoculations Related Traits Fast Metabolism Fallout 3, Fallout 4 Modifies Reduction of radiation exposure Governed By Endurance, armor, Rad-X Initial Value (Endurance - 1) * 2 Related Perks Cyborg, Rad Resistance, Survival Expert, Booster Shot, Pitt Fighter Fallout 76 Modifies Amount of radiation your character is exposed to is reduced by this amount. Initial Value 0

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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.

”— Fallout In-game description

Radiation resistance is a derived statistic in Fallout, Fallout 2, Fallout 3, Fallout Tactics, Fallout: New Vegas, Fallout 4, and Fallout 76.

It reduces radiation damage by a percentage.

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

${\text{Initial level }}\%=({\text{Endurance}}-1)\times 2$

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%.

Fallout 4 and Fallout 76

Damage resistance in both of the Creation Engine games is essentially the same and uses three separate armor types for the three available damage types:

• DamageResist, used to determine resistance against ballistic or normal weapons - most conventional firearms, melee, and unarmed weapons, as well as creature attacks,
• EnergyResist, used against weapons dealing energy damage,
• RadiationResist, used against - what else? - radiation-based weapons.

To determine the damage reduction, the game first checks the following:

• If target has 0 Armor = 0% DamageReduction
• If Armor < 15% AttackDamage = 1% Damage Reduction
• If Armor > 550x Attack Damage = 95% Damage Reduction

Otherwise, it performs the following calculation:

DamageReduction = 1-0.5*(AttackDamage / DamageResist)^0.3653

At extreme values, Energy damage can be nullified, but Ballistic or Normal damage will only be reduced by a max of 95%.

Gallery

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  Fallout icon Radiation Resistance

Derived statistics Combat statistics Action Points · Critical Chance · Melee Damage · Reload Speed · Sequence · Unarmed Damage Defense statistics Armor Class · Damage Resistance · Damage Threshold · Energy Resistance  · Fire Resistance · Poison Resistance · Radiation Resistance Character statistics Carry Weight · Fatigue · Healing Rate · Hit Points · Party Limit · Perk Rate Hardcore and Survival statistics Fallout: New Vegas: Dehydration · Sleep · Starvation Fallout 4: Thirst · Sleep · Hunger Fallout 76: Thirst · Hunger