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Radiation induced attenuation in perfluorinated polymer optical fibres for dosimetry applications
(2016)
Real-time measurement of radiation-induced attenuation (RIA) in a commercial perfluorinated polymer optical fibre (PF-POF) is performed with regard to on-line radiation monitoring purposes. Spectral character and dose dependence of fibre’s RIA is measured in 450-900 nm spectral region. Fibre exhibited high radiation sensitivity in the visible region with strong increase towards the UV wavelengths. Good linearity and high sensitivity reaching up to 130 dBm-1/kGy was demonstrated in the VIS region for a low dose range. This of the shelf PF-POF could be therefore interesting for on-line remote dosimetry applications.
Impact of gamma radiation on transmission of a commercial Cytop polymer optical fibre (Lucina, Asahi Glass Company) is investigated. Spectral dependence of radiation induced attenuation in the investigated fibre is measured in the VIS-NIR spectral region. Besides attenuation increase, radiation is found to increase fibre susceptibility to water as well. While pristine Cytop fibre is rather humidity insensitive, strong humidity related absorption in the NIR region is observed after fibre irradiation. Selective irradiation of separate fibre sections is proposed as a way of fibre humidity sensitization and quasi-distributed water detection is demonstrated using optical time domain reflectometry at 1310 nm.
In the last decades, considerable attention has been paid to the development of polymer optical fibers (POFs) that may, in certain cases, represent more suitable or cost effective alternative to their glass based counterparts. Due to some of their unique properties, POFs have found their applications in the area of data transmission, lighting as well as optical sensing. Compared to the glass based fiber sensors, POFs are more robust and flexible yielding sensors suitable also for larger strain applications. They have better biocompatibility and are generally more acceptable for medical applications. In addition, POFs can provide higher inherent sensitivity to some of the more alternative measurands such as humidity or ionizing radiation.
Over the last three years, BAM’s Division 8.6 has been participating in the European FP7 project “TRIPOD” devoted to the development of POF technology for sensing applications. Project activities and main technological achievements will be reviewed. Special attention will be paid to the utilization of optical fiber sensors in radiation environments. In the recent years, ionizing radiation has found numerous applications also outside the nuclear industry, e.g. in material processing, sterilization or medical applications. With increasing importance of radiation processes, demand for suitable monitoring techniques is rising as well. Among available dosimetry solutions, optical fiber based dosimeters offer numerous advantages such as electromagnetic immunity, small dimensions and possibility of remote and real time monitoring. A concept of attenuation based radiation sensing with perfluorinated POFs will be investigated and presented as a potential candidate for low cost easy to use on line radiation monitoring system.
Application importance of ionizing radiation has been growing steadily over the last decades. Extensive utilization of ionizing radiation generates demand for development of suitable monitoring techniques. Radiation monitoring systems based on optical fibers offer several key advantages such as small footprint, possibility of remote and real-time measurement as well as electromagnetic immunity. In this contribution, we investigate radiation-induced attenuation (RIA)-based sensing with perfluorinated polymer optical fibers (PF-POFs). The RIA response of two commercial PF-POFs is assessed in a low dose region and performance and limitations of the system are discussed. The concept represents a potential high-sensitivity, low-cost and easy-to-use on-line radiation monitoring system with distributed detection capability.