Acute Radiation SyndromeRadiation InjuriesRadiation Injuries, ExperimentalRadioactive Hazard ReleaseRadiodermatitisRadiation DosageDose-Response Relationship, RadiationSyndromeRadiation-Protective AgentsWhole-Body IrradiationRadiation PneumonitisProctitisRadiometryRadiation ToleranceLethal Dose 50RadiotherapyRadiation, IonizingGamma RaysTreatment OutcomeSalpingostomyRadiationRadiation ProtectionMice, Inbred C57BLRadiation MonitoringDown SyndromeMetabolic Syndrome XTime FactorsRadiotherapy Planning, Computer-AssistedTreatment FailureRadiotherapy DosageFollow-Up StudiesRadiation OncologyDisease Models, AnimalProspective StudiesRetrospective StudiesSeverity of Illness Index