OOC: External radiation from gamma rays is often to be the leading cause of radiation sickness. Internal radiation from breathing in irradiated gas or ingesting something will lead to being internally exposed to alpha and beta radiation, (because alpha cannot penetrate the skin and can only be harmful if it's inside.) Alpha cannot penetrate paper, and beta cannot penetrate aluminum but it can penetrate the skin. Symptoms of radiation sickness, should the subject remain exposed to an irradiated source, include vomiting, skin burns, diarrhea, nausea, and can eventually lead to death.