When characters are exposed to radiation, they may be afflicted with radiation sickness. Radiation sickness functions exactly like exposure to any other disease, following the normal rules for diseases. The Fortitude save DC and the effects of radiation sickness vary with the dose of radiation to which a creature is exposed.
Radiation exposure has five degrees: mild, low, moderate, high, and severe. To determine the degree of exposure, start with the type of exposure: either an irradiated area or a specific source of radiation. Then consult Table: Radiation Exposure to determine the degree of exposure based on the total time of exposure within a given 24-hour period (rounding up).
The degree of the exposure determines the severity of the radiation sickness, as indicated on Table: Radiation Sickness. At low levels, radiation sickness is a slow disease. Often, a sick character suffers no severe short-term effects. This is reflected in the fact that even with a failed Fortitude save, the character might not suffer any Constitution loss.
|Table: Radiation Exposure|
|-Time of Exposure-|
|Situation||1 rnd||1 min||10 min||1 hr||1 day|
|Character in irradiated area:|
|Character exposed to radiation source:|
|Mildly radioactive materials||mild||mild||low||low||low|
|Highly radioactive materials||moderate||moderate||high||high||severe|
|Severely radioactive materials||moderate||high||severe||severe||severe|
|Table: Radiation Sickness|
|Degree of Exposure||Fort Save DC||Damage|
|*Minimum damage 0 Con.|