New OSL detectors based on LiMgPO4 crystals grown by micro pulling down method. Dosimetric properties vs. growth parameters

Kulig, D.; Gieszczyk, W.; Bilski, P.; Marczewska, B.; Kłosowski, M.

doi:10.1016/j.radmeas.2016.01.028

Cited by 21 publications

(11 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, another promising OSL material, namely the LiMgPO 4 (LMP), has been used as OSL powder embedded into a silicone host. Its promising dosimetric properties, a high radio-sensitivity, broad linear dose response (up to 1 kGy), good repeatability and acceptable fading [14][15][16][17][18][19], allow for considering the LMP material as the future alternative for the commercially available OSL materials. Recently, by using a 2D LMP-based silicone host and a self-developed optical imaging setup for 2D OSL readouts, a real 3D depth dose distribution of the single, unmodulated proton Bragg peak has been measured and compared within a standard proton QA procedure using the ionization chamber [18].…”

Section: Introductionmentioning

confidence: 99%

3D Dosimetry Based on LiMgPO4 OSL Silicone Foils: Facilitating the Verification of Eye-Ball Cancer Proton Radiotherapy

Sądel

Gajewski

Sowa

et al. 2021

Sensors

View full text Add to dashboard Cite

A direct verification of the three-dimensional (3D) proton clinical treatment plan prepared for tumor in the eyeball, using the Eclipse Ocular Proton Planning system (by Varian Medical Systems), has been presented. To achieve this, a prototype of the innovative two-dimensional (2D) circular silicone foils, made of a polymer with the embedded optically stimulated luminescence (OSL) material in powder form (LiMgPO4), and a self-developed optical imaging system, consisting of an illuminating light source and a high-sensitive CCD camera has been applied. A specially designed lifelike eyeball phantom has been used, constructed from 40 flat sheet LMP-based silicone foils stacked and placed together behind a spherical phantom made by polystyrene, all to reflect the curvature of the real eyeball. Two-dimensional OSL signals were captured and further analyzed from each single silicone foil after irradiation using a dedicated patient collimator and a 58.8 MeV modulated proton beam. The reconstructed 3D proton depth dose distribution matches very well with the clinical treatment plan, allowing for the consideration of the new OSL system for further 3D dosimetry applications within the proton radiotherapy area.

show abstract

Section: Introductionmentioning

confidence: 99%

3D Dosimetry Based on LiMgPO4 OSL Silicone Foils: Facilitating the Verification of Eye-Ball Cancer Proton Radiotherapy

Sądel

Gajewski

Sowa

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…A lot of attention is now payed for lithium magnesium phosphate (LiMgPO 4 , LMP) compound, as it shows a high radio-sensitivity and a broad linear dose-response range [4]. Since 2010, almost 30 research papers on luminescent properties of differently doped LMP, as a good candidate for application in ionizing radiation dosimetry, have been published [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]. Among them, the Tb and B co-doped LMP is most extensively studied [6,7,8,9,11,12,16,17,19,24,26,27,28], however, the other rare-earths dopants, like e.g., Eu [5,13,15,29], Sm [10,15], Tm [23,29], Er [29], and Y [29], were also considered and investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, the Tb and B co-doped LMP is most extensively studied [6,7,8,9,11,12,16,17,19,24,26,27,28], however, the other rare-earths dopants, like e.g., Eu [5,13,15,29], Sm [10,15], Tm [23,29], Er [29], and Y [29], were also considered and investigated. In most cases, the samples in form of the powders or cold-pressed and sintered pellets (mixed with polytetrafluoroethylene, PTFE) have been studied, but also the LMP crystals were successfully grown from the melt by micro-pulling-down method [4,18,21,22,29]. The LMP samples in crystal form show considerable advantages over the powders and pellets [22].…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence Enhancement of LiMgPO4 Crystal Host by Tb3+ and Tm3+ Trivalent Rare-Earth Ions Co-doping

et al. 2019

Self Cite

View full text Add to dashboard Cite

We investigated the influence of terbium and thulium trivalent rare-earth (RE) ions co-doping on the luminescent properties enhancement of LiMgPO4 (LMP) crystal host. The studied crystals were grown from the melt by micro-pulling-down (MPD) technique. Luminescent properties of the obtained crystals were investigated by thermoluminescence (TL) method. The most favorable properties and the highest luminescence enhancement were measured for Tb and Tm double doped crystals. A similar luminescence level can be also obtained for Tm, B co-doped samples. In this case, however, the low-temperature TL components have a significant contribution. The measured luminescent spectra showed a typical emission of Tb3+ and Tm3+ ions of an opposite trapping nature, namely the holes and electron-trapping sites, respectively. The most prominent transitions of 5D4 → 7F3 (550 nm for Tb3+) and 1D2 → 3F4 (450 nm for Tm3+) were observed. It was also found that Tb3+ and Tm3+ emissions show temperature dependence in the case of double doped LMP crystal sample, which was not visible in the case of the samples doped with a single RE dopant. At a low temperature range (up to around 290 °C) Tm3+ emission was dominant. At higher temperatures, the electrons occupying Tm3+ sites started to be released giving rise to emissions from Tb-related recombination centers, and emissions from Tm3+ centers simultaneously decreased. At the highest temperatures, emission took place from Tb3+ recombination centers, but only from deeper 5D4 level-related traps which had not been emptied at a lower temperature range.

show abstract

“…However, in the case of crystals, the situation may look slightly different. As reported many times [14][15][16][17][18][19], high-temperature crystallization changes the energetic distribution of TL-related electron traps in materials, which are strongly manifested in the observed differences between the glow-curves measured for materials in different forms (namely powders and crystals). This may be related to the creation of many different types of structural defects.…”

Section: Introductionmentioning

confidence: 85%

“…In most cases, samples in the form of powder [9], cold-pressed and sintered pellets [8], or fluoropolymer foils [13] have been studied. Recently, this material was also successfully crystallized from melt using a novel micro-pulling-down (MPD) crystal growth technique [14][15][16][17][18]. Further, the melt-grown crystals were found to show substantial advantages over samples in the form of powders [19], which were manifested as significantly reduced luminescence at the low-temperature range that may strongly affect the fading properties of this material.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic and Dopant-Related Luminescence of Undoped and Tb Plus Tm Double-Doped Lithium Magnesium Phosphate (LiMgPO4, LMP) Crystals

et al. 2020

Self Cite

View full text Add to dashboard Cite

In this work, the luminescence properties of undoped, Tm3+ doped, and Tb3+ plus Tm3+ double-doped crystals of the lithium magnesium phosphate (LiMgPO4, LMP) compound were investigated. The crystals under study were grown from melt using the micro-pulling-down method. The intrinsic and dopant-related luminescence of these crystals were studied using cathodo-, radio-, photo-, and thermoluminescence methods. Double doping with Tb3+ and Tm3+ ions was analyzed as these dopants are expected to exhibit an opposite trapping nature, namely to create the hole and electron-trapping sites, respectively. The spectra measured for the undoped samples revealed three prominent broad emission bands with maxima at around 3.50, 2.48, and 1.95 eV, which were associated with intrinsic structural defects within the studied compound. These were expected due to the anion vacancies forming F+-like centers while trapping the electrons. The spectra measured for Tb and Tm double-doped crystals showed characteristic peaks corresponding to the 4f–4f transitions of these dopants. A simplified model of a recombination mechanism was proposed to explain the temperature dependence of the measured thermally stimulated luminescence spectra. It seems that at low temperatures (below 300 °C), the charge carriers were released from 5D3-related Tb3+ trapping sites and recombination took place at Tm-related sites, giving rise to the characteristic emission of Tm3+ ions. At higher temperatures, above 300 °C, the electrons occupying the Tm3+-related trapping sites started to be released, and recombination took place at 5D4-related Tb3+ recombination centers, giving rise to the characteristic emission of Tb3+ ions. The model explains the temperature dependence observed for the luminescence emission from double-doped LiMgPO4 crystals and may be fully applicable for the consideration of emissions of other double-doped compounds.

show abstract

New OSL detectors based on LiMgPO4 crystals grown by micro pulling down method. Dosimetric properties vs. growth parameters

Cited by 21 publications

References 9 publications

3D Dosimetry Based on LiMgPO4 OSL Silicone Foils: Facilitating the Verification of Eye-Ball Cancer Proton Radiotherapy

3D Dosimetry Based on LiMgPO4 OSL Silicone Foils: Facilitating the Verification of Eye-Ball Cancer Proton Radiotherapy

Thermoluminescence Enhancement of LiMgPO4 Crystal Host by Tb3+ and Tm3+ Trivalent Rare-Earth Ions Co-doping

Intrinsic and Dopant-Related Luminescence of Undoped and Tb Plus Tm Double-Doped Lithium Magnesium Phosphate (LiMgPO4, LMP) Crystals

Contact Info

Product

Resources

About