Radiation Injuries, ExperimentalAcute Radiation SyndromeRadiation InjuriesRadioactive Hazard ReleaseRadiation-Protective AgentsRadiodermatitisRadiation DosageDose-Response Relationship, RadiationWhole-Body IrradiationRadiation PneumonitisRadiotherapyRadiation ToleranceProctitisRadiometryGamma RaysRadiation ProtectionRadiation, IonizingLethal Dose 50Mass Casualty IncidentsWounds and InjuriesPlacental ExtractsSurge CapacityMice, Inbred C57BLBrain InjuriesRadiationFluoroscopyIntestinal DiseasesX-RaysRadiotherapy DosageRadiation MonitoringIntestinesAthletic InjuriesSpinal Cord InjuriesReperfusion InjuryTime FactorsBrain NeoplasmsNecrosisRadiation Oncology