OPTICAL PROPERTIES OF MAGNESIUM-ALUMINUM SPINEL IRRADIATED WITH HIGH-ENERGY ELECTRONS OF THE M-30 MICROTRON DOI
Oksana Pop, V. T. Maslyuk, І. Г. Мегела

et al.

Published: Oct. 25, 2024

The study of the optical properties magnesium-aluminum spinel is relevant because material has prospects for practical applications and possibility use in dosimetry. Therefore, it important to radiation resistance spinel. This research aims effect high-energy irradiation, 12.5 MeV, on its features defect formation. It shows that irradiation stimulates formation luminescence centers, which solid-state results indicate using non-stoichiometric as a dosimetric intense beams nuclear radiation.

Language: Английский

Dosimetric and biologic intercomparison between electron and proton FLASH beams DOI Creative Commons
Aymeric Almeida, Michele Togno, Paola Ballesteros‐Zebadúa

et al.

Radiotherapy and Oncology, Journal Year: 2023, Volume and Issue: 190, P. 109953 - 109953

Published: Oct. 13, 2023

The FLASH effect has been validated in different preclinical experiments with electrons (eFLASH) and protons (pFLASH) operating at an average dose rate above 40 Gy/s. However, no systematic intercomparison of the produced by eFLASHvs. pFLASH yet performed constitutes aim present study.

Language: Английский

Citations

19
Dosimetry of ultra-high dose rate electron beams using thermoluminescence and optically stimulated luminescence detectors DOI Creative Commons
Silvia Motta, Riccardo Dal Bello, Jeppe Brage Christensen

et al.

Physics in Medicine and Biology, Journal Year: 2024, Volume and Issue: 69(3), P. 035022 - 035022

Published: Jan. 10, 2024

Abstract Objective. The aim of this work is to investigate the dose rate dependence thermoluminescence and optically stimulated luminescence detectors (TLDs OSLDs) in a wide uniform ultra-high electron beam demonstrate potential use TLDs OSLDs correct ion recombination air-filled ionization chambers. This study avoids previously reported complications related field size homogeneity. Approach. Two types (BeO Al 2 O 3 :C) three (LiF:Mg,Ti, LiF:Mg,Cu,P, CaF :Tm) were irradiated simultaneously 16 MeV generated by clinically decommissioned C-Arm LINAC, modified deliver doses per pulse between 8.3 × 10 −4 Gy 1.255 Gy, corresponding instantaneous rates s −1 5 . A prototype ultra-thin parallel plate chamber was employed as reference detector. Main results. Reproducible results achieved both at conventional (standard deviation data <2%) highest <4%). No trend response observed investigated range. :C OSLD found be most precise detector, with standard <2% all levels. Significance. independence make them good candidates for dosimetry rates, least up independent method measure proposed, which can applied characterize beams

Language: Английский

Citations

9
Investigation of TL and OSL detectors in ultra-high dose rate electron beams DOI Creative Commons
Silvia Motta, Jeppe Brage Christensen,

Franz J. Frei

et al.

Physics in Medicine and Biology, Journal Year: 2023, Volume and Issue: 68(14), P. 145007 - 145007

Published: June 19, 2023

Objective.This work aims at investigating the response of various thermally stimulated luminescence detectors (TLDs) and optically (OSLDs) for dosimetry ultra-high dose rate electron beams. The study was driven by challenges rates importance FLASH radiotherapy radiobiology experiments.Approach.Three types TLDs (LiF:Mg,Ti; LiF:Mg,Cu,P; CaF2:Tm) one type OSLD (Al2O3:C) were irradiated in a 15 MeV beam with instantaneous (1-324) kGy s-1range. Reference carried out an integrating current transformer, which calibrated absorbed to water against reference ionization chamber. Additionally, independent BeO OSLDs employed as reference. Beam non-uniformity addressed using matrix TLDs/OSLDs.Main results.The investigated shown be within experimental uncertainties, take into account uncertainty protocol irradiation uncertainty. relative deviation between lower than 4 % all rates. A decreasing observed Al2O3:C OSLDs, but still 10 from dose.Significance.The precision make them suitable Specifically, independence can support investigation uniformity function rate, is beam. provided high measurements, needs confirmed additional experiments.

Language: Английский

Citations

14
Addressing Current Challenges in OSL Dosimetry Using MgB4O7:Ce,Li: State of the Art, Limitations and Avenues of Research DOI Open Access
Lily Bossin, Igor V. Plokhikh, Jeppe Brage Christensen

et al.

Materials, Journal Year: 2023, Volume and Issue: 16(8), P. 3051 - 3051

Published: April 12, 2023

The objective of this work is to review and assess the potential MgB4O7:Ce,Li fill in gaps where need for a new material optically stimulated luminescence (OSL) dosimetry has been identified. We offer critical assessment operational properties OSL dosimetry, as reviewed literature complemented by measurements thermoluminescence spectroscopy, sensitivity, thermal stability, lifetime emission, dose response at high doses (>1000 Gy), fading bleachability. Overall, compared with Al2O3:C, example, shows comparable signal intensity following exposure ionizing radiation, higher saturation limit (ca 7000 Gy) shorter (31.5 ns). is, however, not yet an optimum it exhibits anomalous shallow traps. Further optimization therefore needed, possible avenues investigation encompass gaining better understanding roles synthesis route dopants nature defects.

Language: Английский

Citations

10
Status of LET assessment with active and passive detectors in ion beams DOI Creative Commons
Jeppe Brage Christensen, Iván Domingo Muñoz, P. Bilski

et al.

Radiation Measurements, Journal Year: 2024, Volume and Issue: 177, P. 107252 - 107252

Published: July 24, 2024

This review explores current experimental methods for determining the radiation quality in ion beams. In this context, is commonly evaluated using averaged linear energy transfer (LET), a metric employed to assess response of both biological and physical systems. Dose LET can be experimentally determined with passive detectors through various techniques that have seen recent improvements. Another related mean lineal energy, which measurable microdosimetric detectors. focuses on available possibilities evaluating three microdosimeters (mini-TEPC, Silicon Telescope, SOI Microplus), luminescence (based optical, thermo-, radiophoto-luminescence), track-based (track-etched detector, Timepix, fluorescent nuclear track detector), chemical detector based alanine. A comparison properties provided along an overview underlying mechanisms enabling assessment or measurements each type. Finally, summarizes determination respect needs assurance particle therapy. Areas future research development are suggested.

Language: Английский

Citations

4
Development of novel ionization chambers for reference dosimetry in electron flash radiotherapy DOI
Kevin Liu,

Shannon M. Holmes,

Ahtesham Ullah Khan

et al.

Medical Physics, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 23, 2024

Reference dosimetry in ultra-high dose rate (UHDR) beamlines is significantly hindered by limitations conventional ionization chamber design. In particular, chambers suffer from severe charge collection efficiency (CCE) degradation high per pulse (DPP) beams.

Language: Английский

Citations

4
Color centers in doped and undoped LiF irradiated with 18 MeV electrons DOI

O. М. Pop,

І. Г. Мегела, V. T. Maslyuk

et al.

Optical Materials, Journal Year: 2025, Volume and Issue: unknown, P. 116942 - 116942

Published: March 1, 2025

Language: Английский

Citations

0
Towards precise LET measurements based on energy deposition of therapeutic ions in Timepix3 detectors DOI Creative Commons

Renato Félix‐Bautista,

Yasmin Hamad,

Tomás Yáñez-González

et al.

Physics in Medicine and Biology, Journal Year: 2024, Volume and Issue: 69(12), P. 125030 - 125030

Published: May 30, 2024

Abstract Objective. There is an increasing interest in calculating and measuring linear energy transfer (LET) spectra particle therapy order to assess their impact biological terms. As such, the accuracy of fluence becomes paramount. This study focuses on quantifying depositions distinct proton, helium, carbon, oxygen ion beams using a silicon pixel detector developed at CERN determine LET silicon. Approach. While detection systems have been investigated this pursuit, scarcity detectors capable providing per-ion data with high spatial temporal resolution remains issue. gap where technology steps in, enabling online tracking single-ion deposition. The used consisted 300 µ m thick sensor operated partial depletion. Main results. During post-processing, artifacts acquired signals were identified methods for corrections developed. Subsequently, correlation between measured Monte Carlo-based simulated deposition distributions was performed, relying two-step recalibration approach based saturating exponential models. Despite observed saturation effects, deviations confined below 7% across entire range track-averaged values from 0.77 keV −1 93.16 . Significance. Simulated mean found be aligned within 7%, after applying artifact corrections. extends accessible clinically relevant validates reliability measurements. These findings pave way towards LET-based dosimetry through translate these measurements water. will addressed future study, extending functionality treatment planning into clinical routine, potential ion-beam utmost precision cancer patients.

Language: Английский

Citations

2
Dosimetric and biologic intercomparison between electron and proton FLASH beams DOI Creative Commons
Aymeric Almeida, Michele Togno, Paola Ballesteros‐Zebadúa

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2023, Volume and Issue: unknown

Published: April 21, 2023

The FLASH effect has been validated in different preclinical experiments with electrons (eFLASH) and protons (pFLASH) operating at a mean dose rate above 40 Gy/s. However, no systematic intercomparison of the produced by e

Language: Английский

Citations

5
Testing the S/SR procedure using TLDs and OSLDs and a lexsyg smart automated reader for precise dosimetry DOI Creative Commons
Silvia Motta, Jeppe Brage Christensen, E.G. Yukihara

et al.

Radiation Measurements, Journal Year: 2023, Volume and Issue: 168, P. 107013 - 107013

Published: Sept. 13, 2023

This work demonstrates the precision achieved with thermoluminescence (TL) and optically stimulated luminescence (OSL) detectors (TLDs OSLDs) using a procedure that takes advantage of capabilities automated TL/OSL readers (lexsyg smart), for potential applications in medical dosimetry. The makes use 90Sr/90Y beta source present reader to correct sample-to-sample sensitivity variations. Typical data obtained four types TLDs (LiF:Mg,Ti, LiF:Mg,Cu,P, CaF2:Tm, Al2O3:C single crystal) two OSLDs (BeO film) are presented along estimated uncertainties achieved. results demonstrate material-specific optimized enables (standard deviation data) better than 3 % 0.2 Gy–2 Gy dose range all materials, except TL signal crystal. highest (¡ 1 %) is OSL from film over wide (∼0.2 10 Gy).

Language: Английский

Citations

4