Radioactive Hazard ReleaseChemical Hazard ReleaseAmericiumRadiation ProtectionRadiation DosageRadiation, IonizingRadiation InjuriesDose-Response Relationship, RadiationRadiation ToleranceProportional Hazards ModelsRadiationRadiation MonitoringRadiation OncologyCosmic RadiationRadiation Injuries, ExperimentalRadiation PneumonitisNeoplasms, Radiation-InducedGamma RaysRadiotherapyBackground RadiationRadiotherapy DosageRadiometryUltraviolet RaysTime FactorsRadiation EffectsCombined Modality TherapyFollow-Up StudiesRadiation-Sensitizing AgentsRadiation-Protective AgentsRisk FactorsTreatment Outcome