Optical Fibers and Optical Fiber Sensors Used in Radiation Monitoring

Sporea, Dan; Sporea, Adelina; O'Keeffe, Sinéad; McCarthy, Denis M.; Lewis, Elfed

doi:10.5772/29119

Cited by 35 publications

(32 citation statements)

References 110 publications

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“…It should also be noted that monitoring radioactive analytes is now possible using fiber optics, since the [U VI O 2 ] 2+ ion shows an intrinsic fluorescence with maxima at 518 and 546 nm, which are compatible with both plastic and glass fibers 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Luminescent Properties of [UO2(TFA)2(DMSO)3], a Promising Material for Sensing and Monitoring the Uranyl Ion

et al. 2016

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An uranyl complex [UO 2 (TFA) 2 (DMSO) 3 ] (TFA=deprotonated trifluoroacetic acid; DMSO=dimethyl sulfoxide) has been successfully synthesized by reacting UO 2 (CH 3 COO) 2 ·H 2 O with one equivalent of (CF 3 CO) 2 O and DMSO. The complex has been characterized by single-crystal X-ray diffraction, X-ray powder diffraction, elemental analysis, FT-IR spectroscopy, thermal analysis and absorption and emission spectroscopies. The spectroscopic properties of the material make it suitable for its application in the sensing and monitoring of uranyl in the PUREX process.

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Section: Introductionmentioning

confidence: 99%

Luminescent Properties of [UO2(TFA)2(DMSO)3], a Promising Material for Sensing and Monitoring the Uranyl Ion

et al. 2016

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“…Spectral measurements were done on-line or off-line, mostly in the visible and near IR range, under gamma-ray, X-ray or neutron irradiation [3][4][5]. On the other side, optical fiber characteristics degradation was exploited in order to build radiation monitoring systems or dosimeters [6][7][8] [22]. Presently, there is no commercial on-line dosimeter to accurately perform absolute dose measurements or to determine the peak and the valley dose, when large factors between ~10-100 are required, with an excellent dynamic range, in the case involving the combination of dose rates of about 16 000 Gy/sec, a relatively low energy spectrum around 100 keV and, an optimal resolution of a few microns.…”

Section: Introductionmentioning

confidence: 99%

Investigation of UV optical fibers under synchrotron irradiation

Sporea¹,

Mihai²,

Sporea³

et al. 2014

Opt. Express

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Abstract:The focus of the present paper deals, for the first time, with commercial UV optical fibers, characterizing their behaviour as they are subjected to very high flux wiggler generated synchrotron radiation. Five distinct types of UV optical fibers, produced by three manufactures, were exposed to total doses between 5 Gy and 2000 Gy. The exposure to synchrotron radiation was performed in two campaigns. The tests were run off-line and considered the dependence of the radiation induced attenuation (RIA) as function of the total dose. The recovery of the radiation induced colour centres was studied at room temperature and after heating the samples up to 560 K. As a première, we also investigated through THz imaging and spectroscopy the irradiated optical fiber samples. Under these conditions, three of the optical fibers proved to be radiation resistant. The two optical fibers sensitive to synchrotron radiation exhibited a linear variation of the optical absorption at the wavelengths of λ = 229 nm, λ = 248 nm, and λ = 265 nm, for total doses between 60 Gy and 2000 Gy. These two samples showed also an increase of the optical absorption in the UV spectral range when heated to 560 K. The optical fibers sensitive to synchrotron radiation can potentially be used for on-line radiation dosimetry. ©2014 Optical Society of America

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“…A current trend in this field, is the use of extrinsic polymer optical fiber (POF) based dosimeters or detectors [6,8,[10][11][12]. These arrangements add the well-known advantages of the use of optical fibers, such as immunity to electromagnetical interferences, small size and weight, multiplexing capabilities, to the easy handling and low cost of the POF.…”

Section: Introductionmentioning

confidence: 99%

“…Rare earth doped phosphors have been successfully applied for this purpose [6,14,15]. Then, the operational principle of such extrinsic sensors is the radiation induced fluorescence, in which the impinging radiation on the phosphor release visible light that is gathered by the POF and driven to the optoelectronics unit to be measured [10]. The suitable phosphor is dependent on both the nature of the radiation to be detected and the energy of the photons belonging to such radiation.…”

Section: Introductionmentioning

confidence: 99%

“…This kind of radiation can be found in nature through radioactive elements, but also can be artificially produced in areas such as nuclear power plants [1,2], industrial facilities [3][4][5], and for diagnostic and therapeutic healthcare applications [6][7][8][9]. Therefore, a proper protection protocol for irradiation prevention must be based on the precise measurement of radiation levels in these areas [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Highly Sensitive Extrinsic X-Ray Polymer Optical Fiber Sensors Based on Fiber Tip Modification

et al. 2017

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Abstract-An extrinsic X-ray fiber sensor with improved sensitivity is presented. The developed device is based on an inorganic scintillator (Terbium doped Gadolinium Oxysulfide) attached to a polymer fiber tip. Sensitivity improvement has been accomplished by modifying the fiber tip in two ways, either by thermomechanical tapering of chemical etching. Thus, the useful surface in contact with the scintillator increases, and so the fluorescence light gathering capability. All the fabricated devices have been tested under X-ray irradiation from a Linac at a dose rate of 300 monitor units/min, with a readout every 100 ms. The obtained results shown a signal improvement of up to 43 times when compared with previous reported proposals using inorganic scintillators and polymer fibers. Moreover, the recorded signal under the same measurement conditions can be further improved if the inorganic scintillator is used in powder format instead into an epoxy matrix.

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Optical Fibers and Optical Fiber Sensors Used in Radiation Monitoring

Cited by 35 publications

References 110 publications

Luminescent Properties of [UO2(TFA)2(DMSO)3], a Promising Material for Sensing and Monitoring the Uranyl Ion

Luminescent Properties of [UO2(TFA)2(DMSO)3], a Promising Material for Sensing and Monitoring the Uranyl Ion

Investigation of UV optical fibers under synchrotron irradiation

Highly Sensitive Extrinsic X-Ray Polymer Optical Fiber Sensors Based on Fiber Tip Modification

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