Acute Radiation SyndromeRadioactive Hazard ReleaseRadiation Injuries, ExperimentalRadiation InjuriesRadiation DosageWhole-Body IrradiationRadiation-Protective AgentsDose-Response Relationship, RadiationLethal Dose 50RadiodermatitisRadiometryRadiation, IonizingRadiation PneumonitisRadiation ToleranceRadiation ProtectionSyndromeRadiation MonitoringProctitis