Characterization of organic glass scintillator bars and their potential for a hybrid neutron/gamma ray imaging system for proton radiotherapy range verification

IF 1.3 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION Journal of Instrumentation Pub Date : 2024-01-01 DOI:10.1088/1748-0221/19/01/P01008
J. Turko, R. Beyer, A. Junghans, I. Meric, S.E. Mueller, G. Pausch, H.N. Ratliff, K. Römer, S. M. Schellhammer, L. Setterdahl, S. Urlass, A. Wagner, T. Kögler
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Abstract

For accurate and simultaneous imaging of fast neutrons (FNs) and prompt gamma rays (PGs) produced during proton therapy, the selection of a highly performant detector material is crucial. In this work, a promising candidate material known as organic glass scintillator (OGS) is characterized for this task. To this end, a precisely-timed source of neutrons and Bremsstrahlung radiation produced by the nELBE facility was used to study the light output and neutron/gamma ray pulse shape discrimination (PSD) properties of a 1 × 1 × 20 cm3 OGS bar with double-sided readout. Furthermore, the energy, timing, and depth-of-interaction (DOI) resolutions of 1 × 1 × 10 cm3 and 1 × 1 × 20 cm3 OGS and EJ-200 bars were characterized with radioactive sources. For electron-equivalent energies above 0.5 MeVee, OGS was found to have excellent PSD capabilities (figure-of-merit above 1.27), energy resolution (below 12%), coincident time resolution (below 500 ps), and DOI resolution (below 10 mm). This work establishes the data analysis methods required for hybrid FN/PG imaging using OGS, and demonstrates the materials' excellent performance for this application.
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有机玻璃闪烁条的特性及其用于质子放疗范围验证的中子/伽马射线混合成像系统的潜力
为了对质子治疗过程中产生的快中子(FNs)和瞬发伽马射线(PGs)进行精确的同步成像,选择一种高性能的探测器材料至关重要。在这项工作中,我们对一种很有前途的候选材料--有机玻璃闪烁体(OGS)--进行了表征。为此,利用 nELBE 设备产生的精确定时的中子和轫致辐射源,研究了 1 × 1 × 20 cm3 OGS 条形双面读出器的光输出和中子/伽马射线脉冲形状辨别(PSD)特性。此外,还利用放射源对 1 × 1 × 10 cm3 和 1 × 1 × 20 cm3 OGS 和 EJ-200 棒的能量、定时和作用深度(DOI)分辨率进行了表征。对于 0.5 MeVee 以上的电子当量能量,OGS 具有出色的 PSD 能力(优越性高于 1.27)、能量分辨率(低于 12%)、重合时间分辨率(低于 500 ps)和 DOI 分辨率(低于 10 mm)。这项工作确立了使用 OGS 进行 FN/PG 混合成像所需的数据分析方法,并证明了这种材料在此应用中的卓越性能。
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来源期刊
Journal of Instrumentation
Journal of Instrumentation 工程技术-仪器仪表
CiteScore
2.40
自引率
15.40%
发文量
827
审稿时长
7.5 months
期刊介绍: Journal of Instrumentation (JINST) covers major areas related to concepts and instrumentation in detector physics, accelerator science and associated experimental methods and techniques, theory, modelling and simulations. The main subject areas include. -Accelerators: concepts, modelling, simulations and sources- Instrumentation and hardware for accelerators: particles, synchrotron radiation, neutrons- Detector physics: concepts, processes, methods, modelling and simulations- Detectors, apparatus and methods for particle, astroparticle, nuclear, atomic, and molecular physics- Instrumentation and methods for plasma research- Methods and apparatus for astronomy and astrophysics- Detectors, methods and apparatus for biomedical applications, life sciences and material research- Instrumentation and techniques for medical imaging, diagnostics and therapy- Instrumentation and techniques for dosimetry, monitoring and radiation damage- Detectors, instrumentation and methods for non-destructive tests (NDT)- Detector readout concepts, electronics and data acquisition methods- Algorithms, software and data reduction methods- Materials and associated technologies, etc.- Engineering and technical issues. JINST also includes a section dedicated to technical reports and instrumentation theses.
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