Time-Resolved Radioluminescence Dosimetry Applications and the Influence of Ge Dopants In Silica Optical Fiber Scintillators

The quality of treatment delivery as prescribed in radiotherapy is exceptionally important. One element that helps provide assurance the ability to carry out time-resolved dose measurements. Reports on doped silica optical fibers scintillators using radioluminescence (RL) based dosimetry have indicated merits, especially regarding robustness, versatility, wide dynamic range, and high spatial resolution. Topping list measurements, alluding pulse-by-pulse dosimetry. For effective temporal resolution enabled by high-speed electronics scintillator material offering sufficiently fast rise decay time. In present work, we examine influence Ge doping RL response Ge-doped fiber scintillators. We particularly look at size core relative diameter, its associated effects it adjusted from single-mode geometry a large core-to-cladding ratio structure. primary objective produce structure facilitates short times with yield for characterization was carried high-energy clinical X-ray beam (6 MV), delivered an Elekta Synergy linear accelerator located Advanced Medical Dental Institute, Universiti Sains Malaysia (USM). samples, fabricated chemical vapor deposition methods, comprised small low ratios, respectively. Accordingly, these samples having different Ge-dopant contents offer distinct numbers defects amorphous network. Responses were recorded six dose-rates (between 35 MU/min 590 MU/min), photomultiplier tube setup photon-counting circuit capable gating time 1 ?s. showed response, differing memory afterglow depending geometry. Samples relatively (<1 ms). results suggest contribution Ge-doping affecting triplet states SiO2 matrix, thereby reducing phosphorescence effects. This desirable feature scintillating glass materials enables avoiding pulse pile-up effect, dose-rate applications. These demonstrate potential optical-fiber scintillators, use radiation