Design and Characterisation of an Optical Fibre Dosimeter Based on Silica Optical Fibre and Scintillation Crystal

0562894 - ÚPT 2023 RIV CH eng J - Článek v odborném periodiku
Jelínek, Michal - Číp, Ondřej - Lazar, Josef - Mikel, Břetislav
Design and Characterisation of an Optical Fibre Dosimeter Based on Silica Optical Fibre and Scintillation Crystal.
Sensors. Roč. 22, č. 19 (2022), č. článku 7312. E-ISSN 1424-8220
Grant CEP: GA MŠMT(CZ) EF16_026/0008460; GA MŠMT(CZ) LO1212; GA MŠMT ED0017/01/01
Institucionální podpora: RVO:68081731
Klíčová slova: gamma radiation measurement * silica optical fibres * dosimetry * fibre sensors * ionising radiation detection
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 3.9, rok: 2022
Způsob publikování: Open access
https://www.mdpi.com/1424-8220/22/19/7312

In nuclear power plants, particle accelerators, and other nuclear facilities, measuring the level of ionising gamma radiation is critical for the safety and management of the operation and the environment's protection. However, in many cases, it is impossible to monitor ionising radiation directly at the required location continuously. This is typically either due to the lack of space to accommodate the entire dosimeter or in environments with high ionising radiation activity, electromagnetic radiation, and temperature, which significantly shorten electronics' lifetime. To allow for radiation measurement in such scenarios, we designed a fibre optic dosimeter that introduces an optical fibre link to deliver the scintillation radiation between the ionising radiation sensor and the detectors. The sensors can thus be placed in space-constrained and electronically hostile locations. We used silica optical fibres that withstand high radiation doses, high temperatures, and electromagnetic interference. We use a single photon counter and a photomultiplier to detect the transmitted scintillation radiation. We have shown that selected optical fibres, combined with different scintillation materials, are suitable for measuring gamma radiation levels in hundreds of kBq. We present the architecture of the dosimeter and its experimental characterisation with several combinations of optical fibres, detectors, and scintillation crystals.
Trvalý link: https://hdl.handle.net/11104/0335063