OSL dosimetric properties of cerium doped lutetium orthosilicates

Twardak, A.; Bilski, P.; Zorenko, Yu.; Gorbenko, V.; Sidletskiy, O.

doi:10.1016/j.radmeas.2014.02.018

Cited by 14 publications

(5 citation statements)

References 9 publications

(11 reference statements)

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“…All results presented in this work were acquired from irradiation and readout of a

50\times 50\times 50

^3

YSO:Ce crystal from Epic Crystal. This crystal is part of the oxyorthoscilicate (A

_2

SiO

_5

, A=Lu,Y,Gd) scintillator family, which is known to exhibit OSL 24–28 and has recently been demonstrated to include a scintillator with an OSL light yield sufficiently high to enable 3D OSL‐based dosimetry 22,29 . The crystal was mounted in a custom‐made protective mount during all irradiations and readouts.…”

Section: Methodsmentioning

confidence: 99%

High‐resolution three‐dimensional dosimetry in clinically relevant volumes utilizing optically stimulated luminescence

Jensen,

Julsgaard,

Turtos

et al. 2023

Medical Physics

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BackgroundThe continued development of new radiotherapy techniques requires dosimetry systems that satisfy increasingly rigorous requirements, such as high sensitivity, wide dose range, and high spatial resolution. An emerging requirement is the ability to read out doses in three dimensions (3D) with high precision and spatial resolution. A few dosimetry systems with 3D capabilities are available, but their application in a clinical workflow is limited for various reasons, primarily originating from their chemical nature. The search for a 3D dosimetry system with potential for clinical implementation is thus ongoing.PurposeTo demonstrate the capabilities of a novel optically‐stimulated‐luminescence (OSL)‐based 3D dosimetry system capable of measuring radiation doses in clinically relevant volumes.MethodsA laser‐based readout system was used to measure dose distributions delivered by both photons and protons, utilizing the OSL from a mm3YSO:Ce crystal. A homogeneous treatment plan consisting of two opposing photon fields was used to establish an inhomogeneity correction map of the crystal response and demonstrated the accuracy and precision of the system. The crystal was additionally irradiated with a photon treatment plan consisting of three overlapping 10 × 10 mm2fields delivered from different angles, and a proton treatment plan consisting of four pencil beams with energies 90 MeV (× 2), 115 MeV, and 140 MeV. The system abilities were quantified by comparing the 3D‐resolved measurements to Monte Carlo simulations.ResultsThe dose map reproducibility of the system was found to be within 2% including both statistical and systematic errors. The measurements yielded integrated doses from a volume of mm3with voxel volumes of just mm3. An excellent agreement between the 3D‐resolved measurements and the simulations was found for both photon‐ and proton‐irradiation.ConclusionsThe capabilities of the devised system for measuring clinically relevant fields of photons and proton pencil beams within a clinically relevant volume were demonstrated. The system poses as a promising candidate for clinical applications, and enables future research in the field of OSL‐based tissue‐equivalent 3D dosimetry.

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“…All results presented in this work were acquired from irradiation and readout of a

50\times 50\times 50

^3

YSO:Ce crystal from Epic Crystal. This crystal is part of the oxyorthoscilicate (A

_2

SiO

_5

Section: Methodsmentioning

confidence: 99%

High‐resolution three‐dimensional dosimetry in clinically relevant volumes utilizing optically stimulated luminescence

Jensen,

Julsgaard,

Turtos

et al. 2023

Medical Physics

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“…where T is total illumination time, which is ∼120 s here. Method of calculation of photoionization cross section (s) was described by Twardak et al [8]. Photoionization cross section is related to detrapping probability and maximum stimulation photon flux (J):…”

Section: Deconvolutionmentioning

confidence: 99%

Linearly Modulated OSL in K\(_{3}\)Na(SO\(_{4}\))\(_{2}\):Eu\(^{3+}\) Phosphor Irradiated With 48 MeV Li\(^{3+}\) and 85 MeV C\(^{6+}\) Swift Heavy Ions Beam

Saran

Sahare

2022

Jour. Atom. Mol. Conden. Matt. Nano Physics

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K 3 Na(SO 4 ) 2 :Eu 3+ shows OSL when irradiated with swift heavy ion beams of Li 3+ and C 6+ at different fluences. The micro sample is prepared through solid state diffusion method along with its counter parts of ball milled (7 days) nanophosphor and co-precipitated nanophosphor samples. The material was characterized by XRD to confirm its formation in a single phase. Comparison of the experimental data with that of the data available in the literature (JCPDS data file #74 0398) shows formation of a single hexagonal phase, with the space group P3 m1. Study on the particle size effect shows that particle size in the 75-106 µm rangeis more suitable for the linearly modulated-optically stimulated luminescence (LM-OSL) dosimetry in micro form. Dosimetric properties of the phosphor material using LM-OSL technique for blue light stimulation (λ = 470 nm and t = 120 seconds) show that it is highly sensitive in the linear dose range. Here in this paper, we tried to find a relationship between detrapping probabilities and photoionization cross section using curve fitting (deconvolution) method. We also calculated and converted the fluence into doses using SRIM software. Data are presented indicating that the LM-OSL peak is composed of three overlapping components originating from populated traps with optical cross sections of 10 −17 -10 −18 cm 2 . It was found that micro and ball milled nanophosphor Carbon ion beam irradiated samples dominates the photoionization cross section as compared with lithium ion irradiated samples, but co-precipitated sample is dominant in lithium irradiated samples. Which infers about the different trapping level formation and also recombination processes involved during the preparation and in readouts of samples.

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“…Scintillators represent the forefront of room-temperature radiation detection and spectroscopy, and have also found applications for real-time beam imaging in the form of liquid scintillators [19,20]. Moreover, OSL properties have been reported in cerium-doped compounds of the lutetium orthosilicate scintillator family Lu(2-x)YxSiO5 (LYSO:Ce) [21][22][23], indicating that these scintillators could also be interesting for dosimetry. A recent study [24] found the OSL yield of commercial LYSO:Ce crystals to be high enough to enable high-spatial-resolution dose imaging in 3D for photon and electron excitation.…”

Section: Introductionmentioning

confidence: 99%

3D optically-stimulated-luminescence-based dosimetry using LYSO:Ce scintillators

Jensen,

Turtos,

Muren

et al. 2023

J. Phys.: Conf. Ser.

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The search for a reusable 3D dosimeter is ongoing and motivated by the impact it would have on development and verification of complex modalities in radiotherapy. We present a proof-of-concept 3D measurement of a proton-irradiated LYSO:Ce scintillator, using the resettable photon-emission mechanism known as optically stimulated luminescence and a novel optical readout system. Through this demonstration, we show that LYSO:Ce, in addition to being capable of real-time beam imaging, can be employed as a reusable post-irradiation 3D dosimeter with high spatial resolution.

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OSL dosimetric properties of cerium doped lutetium orthosilicates

Cited by 14 publications

References 9 publications

High‐resolution three‐dimensional dosimetry in clinically relevant volumes utilizing optically stimulated luminescence

High‐resolution three‐dimensional dosimetry in clinically relevant volumes utilizing optically stimulated luminescence

Linearly Modulated OSL in K\(_{3}\)Na(SO\(_{4}\))\(_{2}\):Eu\(^{3+}\) Phosphor Irradiated With 48 MeV Li\(^{3+}\) and 85 MeV C\(^{6+}\) Swift Heavy Ions Beam

3D optically-stimulated-luminescence-based dosimetry using LYSO:Ce scintillators

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