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In this paper, we explored the feasibility study of using the optic fiber wire to be a light transmitter for crystal scintillation material in the radiation measurement. The high-density material; thallium doped cesium iodide CsI (Tl) are widely used as converters for Gamma-rays and X-rays into visible light. Optic fibers are applied in the various applications such nuclear facilities, future fusion installations, medical treatment and diagnostic premises etc. The major advantages to be considered in optic fibers for radiation detection because their characteristics such as: capacities to work under electromagnetic fields; possibility to carry the wavelength signals; small size and low mass including possibility to monitor parameters from the sites far away from the controller. In this work, the cylindrical crystal CsI (Tl) material was connected with the single-clad optic scintillating fiber which transmitted the light signal to photodiode. Gamma-rays and X-rays sources had been investigated the measurement. The optic scintillating fibers have a good response with Cs-137 gamma radiation source at 662 keV. X-ray radiation that was generated from the X-ray tube was determined with the different operating voltages. The obtained results show this device can measure the X-ray radiation with energy range from 39 to 309 keV. CsI (TI) photodiode detector with optic fiber wire can be applied to measure gamma radiation and X-ray radiation as well as being able to the further work in the nuclear and radiation fields.

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