Evaluation of Optical Fibre Based Sensor for use in Brachytherapy Treatment

This paper presents an evaluation of optical fibre sensors for use in brachytherapy treatment where the sensor tip is embedded with radiosensitive scintillation powder, Terbium doped Gadolinium Oxysulphide (Gd2O2S:Tb). Two sensors, fabricated using the same fiber design parameter and size, have been fabricated and evaluated using a Standard Imaging HDR 1000 Well Chamber for increasing numbers of brachytherapy seeds. A sensor holder was designed and 3-D printed to accommodate both the seeds and the sensor for this evaluation purposes. The results show a linear response with number of seeds and demonstrate an excellent agreement with the seed activity measured using a commercial type well chamber. In future, this can be a potential calibration methods for optical fibre sensors prior to use in brachytherapy.