Irradiated is an Affliction.
The Target takes A.P. Damage equal to the number of instances of Irradiated they are afflicted with based on their Physiology.
This effect is applied at the start of the afflicted Target's Turn, then the number of instances is reduced by 1. Should a Target have 0 instances, they are no longer afflicted.
Please Note: A Target may have more than one Physiology, as such you should discuss and resolve this effect as you deem Appropriate.