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Sensitive Fibre-Based Thermoluminescence Detectors for High Resolution In-Vivo Dosimetry.

Ghomeishi M, Mahdiraji GA, Adikan FR, Ung NM, Bradley DA - Sci Rep (2015)

Bottom Line: The results show that in collapsing the capillary fibre into a flat shape, the TL yield is increased by a factor of 5.5, the yield being also some 3.2 times greater than that of the conventional cylindrical fibre fabricated from the same perform.This suggests a means of production of suitably sensitive TLD for in-vivo dosimeter applications.Addressing the associated defects generating luminescence from each of the optical fibres, the study encompasses analysis of the TL glow curves, with computerized glow curve deconvolution (CGCD) and 2(nd) order kinetics.

View Article: PubMed Central - PubMed

Affiliation: Integrated Lightwave Research Group, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.

ABSTRACT
With interest in the potential of optical fibres as the basis of next-generation thermoluminescence dosimeters (TLDs), the development of suitable forms of material and their fabrication has become a fast-growing endeavour. Present study focuses on three types of Ge-doped optical fibres with different structural arrangements and/or shapes, namely conventional cylindrical fibre, capillary fibre, and flat fibre, all fabricated using the same optical fibre preform. For doses from 0.5 to 8 Gy, obtained at electron and photon energies, standard thermoluminescence (TL) characteristics of the optical fibres have been the subject of detailed investigation. The results show that in collapsing the capillary fibre into a flat shape, the TL yield is increased by a factor of 5.5, the yield being also some 3.2 times greater than that of the conventional cylindrical fibre fabricated from the same perform. This suggests a means of production of suitably sensitive TLD for in-vivo dosimeter applications. Addressing the associated defects generating luminescence from each of the optical fibres, the study encompasses analysis of the TL glow curves, with computerized glow curve deconvolution (CGCD) and 2(nd) order kinetics.

No MeSH data available.


Fading of: (a) flat fibre; (b) cylindrical fibre, and; (c) capillary fibre, all for a period of one month subsequent to irradiation to 6 MV photons to a dose of 8 Gy.
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f4: Fading of: (a) flat fibre; (b) cylindrical fibre, and; (c) capillary fibre, all for a period of one month subsequent to irradiation to 6 MV photons to a dose of 8 Gy.

Mentions: Fading analysis results are shown in Fig. 4a–c, for the flat, cylindrical and capillary fibres respectively. All fibre samples were irradiated simultaneously, use being made of the 6 MV photon source, to a dose of 8 Gy. The TL yield of each set of 5 samples per fibre type were obtained over specified post-irradiation times, from one day to one month post-irradiation. The loss of TL response follows an exponential-like curve, showing rapid fading in the first few days followed by a more linear-like loss subsequently. After 30 days post-irradiation, the TL response for the flat fibre has reduced by 22% compared to that obtained one day after radiation. For the cylindrical and capillary fibres respectively the fading is about 1.6 and 2.5 times greater.


Sensitive Fibre-Based Thermoluminescence Detectors for High Resolution In-Vivo Dosimetry.

Ghomeishi M, Mahdiraji GA, Adikan FR, Ung NM, Bradley DA - Sci Rep (2015)

Fading of: (a) flat fibre; (b) cylindrical fibre, and; (c) capillary fibre, all for a period of one month subsequent to irradiation to 6 MV photons to a dose of 8 Gy.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4551967&req=5

f4: Fading of: (a) flat fibre; (b) cylindrical fibre, and; (c) capillary fibre, all for a period of one month subsequent to irradiation to 6 MV photons to a dose of 8 Gy.
Mentions: Fading analysis results are shown in Fig. 4a–c, for the flat, cylindrical and capillary fibres respectively. All fibre samples were irradiated simultaneously, use being made of the 6 MV photon source, to a dose of 8 Gy. The TL yield of each set of 5 samples per fibre type were obtained over specified post-irradiation times, from one day to one month post-irradiation. The loss of TL response follows an exponential-like curve, showing rapid fading in the first few days followed by a more linear-like loss subsequently. After 30 days post-irradiation, the TL response for the flat fibre has reduced by 22% compared to that obtained one day after radiation. For the cylindrical and capillary fibres respectively the fading is about 1.6 and 2.5 times greater.

Bottom Line: The results show that in collapsing the capillary fibre into a flat shape, the TL yield is increased by a factor of 5.5, the yield being also some 3.2 times greater than that of the conventional cylindrical fibre fabricated from the same perform.This suggests a means of production of suitably sensitive TLD for in-vivo dosimeter applications.Addressing the associated defects generating luminescence from each of the optical fibres, the study encompasses analysis of the TL glow curves, with computerized glow curve deconvolution (CGCD) and 2(nd) order kinetics.

View Article: PubMed Central - PubMed

Affiliation: Integrated Lightwave Research Group, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.

ABSTRACT
With interest in the potential of optical fibres as the basis of next-generation thermoluminescence dosimeters (TLDs), the development of suitable forms of material and their fabrication has become a fast-growing endeavour. Present study focuses on three types of Ge-doped optical fibres with different structural arrangements and/or shapes, namely conventional cylindrical fibre, capillary fibre, and flat fibre, all fabricated using the same optical fibre preform. For doses from 0.5 to 8 Gy, obtained at electron and photon energies, standard thermoluminescence (TL) characteristics of the optical fibres have been the subject of detailed investigation. The results show that in collapsing the capillary fibre into a flat shape, the TL yield is increased by a factor of 5.5, the yield being also some 3.2 times greater than that of the conventional cylindrical fibre fabricated from the same perform. This suggests a means of production of suitably sensitive TLD for in-vivo dosimeter applications. Addressing the associated defects generating luminescence from each of the optical fibres, the study encompasses analysis of the TL glow curves, with computerized glow curve deconvolution (CGCD) and 2(nd) order kinetics.

No MeSH data available.