Dose-Response Relationship, DrugToxicologyTime FactorsRadiation DosageRadiation, IonizingDose-Response Relationship, RadiationRadiation InjuriesToxicity TestsRadiation ToleranceRadiationCarcinogenicity TestsRadiation MonitoringRadiation ProtectionForensic ToxicologyRadiometryNeoplasms, Radiation-InducedRadiation OncologyCarcinogensOxytropisAnimal Testing AlternativesRadiotherapy DosageGamma RaysRats, Inbred F344Cosmic RadiationRadiation Injuries, ExperimentalToxicogeneticsMutagenicity Tests