Radiated

Your character is suffering from a significant amount of radiation poisoning. The more radiation, the deadlier the effect.

Causes

Both players and the NPCs they control can get irradiated in three ways:

Even the smallest dose of radiation will generate a message and the 'Radiated' indicator will be highlighted on the character's profile screen.
- In-game message: You feel very nauseous.

At 50 rads (2.78%), the 'Radiated' indicator will appear and persist in the upper-left corner of the main screen as well. If you hover your cursor over this, you can see what percentage of radiation you have.
- In-game message: You feel very nauseous, and after some mild vomiting, slightly fatigued.

At 200 rads (11.11%), a character's health will be adversely affected, causing a temporary loss of 1 SPECIAL point.
- In-game message: You are very fatigued, the vomiting does not stop, and your recovery time is impaired.

At 375 rads (20.83%), a character's health will be significantly affected, resulting in a temporary loss of 2-5 SPECIAL points.
- In-game message: You are hemorrhaging violently. You are very sick, and your hair is falling out.

If one's irradiation level reaches 1800 rads (100%), the character dies
Respawning does not reset the irradiation level of the one who died; it only lowers the absorbed dose to just below its lethal value provided the death occurred due to irradiation.

A Geiger counter, as well as the percentage that shows up on the Radiated pop-up, can be used to monitor one's current irradiation level.
Radiation resistance lowers the percentage of background radiation that affects the player. It can be temporarily boosted by using Rad-X.
A player can permanently elevate his/her radiation resistance by obtaining the Rad Resistance and/or Snakeater support perks.
Radiation poisoning can be self-treated with the drug RadAway. Alternatively, one may choose to receive treatment from one of the NPC doctors at a cost equal to 50 caps multiplied by the level of the player undergoing the treatment