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A novel extrinsic optical fiber X-Ray dosimeter for biomedical applications is presented.The scintillation material in the sensor tip emits visible light upon exposure to x-ray energy and the resultant low intensity light is coupled to a PMMA (poly methyl methacrylate) plastic optical fiber, which guides it towards a distal fluorescent optical spectrometer at 30m distance.Initial has shown the scintillating optical fiber X-ray dosimeter exhibits excellent sensitivity and repeatability upon excitation from a calibrated Clinical Linear Accelerator (LinAC) source.Recent results from extensive on-site testing at radiotherapy clinics at UCLA (USA), Belfast City Hospital (UK) and 1st Hospital Harbin (China) are presented and the performance of the sensor assessed.