Assessment of Ge-doped optical fibre as a TL-mode detector

Abstract

This study analyses the thermally stimulated luminescence or thermoluminescence (TL) glow curve between 300 and 773 K of germanium-doped silica optical fibre. A main glow peak at 530 K with a characteristic spectral emission centred at 400 nm is found. Both features are particularly suitable for dosimetry.Thus, an investigation by the TL technique of some first clinically relevant features of a TL sensor like the doseand dose rate-responses is examined. The presented studies show that germanium doped silica fibres have potential dosimetric properties and should be excellent TL-mode detectors in instances of radiotherapy (clinical dosimetry) and in-vivo radiation dosimetry as well in the field of nuclear facilities.

Global View on Dose Rate Effects in Silica-Based Fibers and Devices Damaged by Radiation-Induced Carrier Trapping

“…This is e.g. the case in germanium-doped fibers, where recombination mainly takes place on germanium-related oxygen deficient centers [9], or in ytterbium-doped fibers where ytterbium ions were shown to be the largely predominant RCs [8]. Then, color centers are essentially related to the trapping of carriers whose polarity is opposite to the charge of RCs.…”

State of the art on nuclear heating measurement methods and expected improvements in zero power research reactors

“…Researchers from LPMC 14 recently explored the TL properties of Ge-doped fibers previously stripped of their polymer sheath (caution related to the fiber heating) and then irradiated with X-rays [52]. It has been shown that such type of fiber, used itself as a dosimeter, fulfills the TL characteristics required by medical dosimetry, such as high sensitivity and dynamic range, and low dependency on the dose rate.…”

“…The laser stimulation of the OSLD is triggered through the fiber at the end of irradiation, and the luminescent signal is immediately transmitted via the fiber to the PMT [54][55][56][57]. The OSL emission following a stimulation pulse is very fast, and then Comparison of the glow curves of GeD2 fiber, TLD-700 and TLD-500 irradiated and read out in the same experimental conditions [52]. Fig.…”

Collapsed optical fiber: A novel method for improving thermoluminescence response of optical fiber

“…In attempts to improve the TL response of SiO 2 , investigations have been performed using different phosphor additives and extrinsic dopants in glass and optical fibers, the dopants including aluminum [6], germanium [4,[6][7][8], lithium and barium [9], zirconium oxide (ZrO 2 ) [10], copper activated calcium borate (CaB 4 O 7 :Cu) nanocrystals [11], manganese doped calcium tetraborate (CaB 4 O 7 :Mn) nanocrystal [12], lithium potassium borate glass doped with titanium oxide (TiO 2 ) and magnesium oxide (MgO) [13], di-potassium yttrium fluoride (K 2 YF 5 ) crystals doped with samarium (Sm 3 þ ) and terbium (Tb 3 þ ) ions [14].…”