Medical Physics, Dosimetry, Radiotherapy, Safety Measures, Radiation, Risk Assessment, Matrix Method, Evaluation, Tools, Failures, Recommendations, Accidents, Quality Assurance, Safety Measures, Lessons Learned, Safety Assessment, Brachytherapy, Implementation, Generic Radiotherapy, Safety Programmes, Operational Experience, Consequences, High Dose Rate, Low Dose Rate, High Risk, External Beam Therapy, Exposure, Barriers, Accelerator