Illness induced by ionizing radiation, ranging in severity from nausea, vomiting, headache, and diarrhea to loss of hair and teeth, reduction in red and white blood cell counts, extensive hemorrhaging, sterility, and death.辐射病：由离子辐射引起的疾病，表现为疲乏、恶心、头痛、腹泻，直至毛发和牙齿脱落、红血球和白血球减少、大量出血、不育和死亡