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Improvement on Gamma Energy Resolution of Plastic scintillator by Adding PMMA Light Guider or Chamfer

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第S1期35卷 63-67页

作者： Wang Yi Wei Zhiyong Fang Meihua Guo Yipan Yu Junhao Laboratory of Space Radiation Detection College of AstronauticsNanjing University of Aeronautics and Astronautics

Traditional plastic scintillator has respectively low gamma energy *** radiation detection need the plastic scintillator to keep a relatively better energy resolution for *** we did experiments to study how to get it enhanced by adding light guider and chamfer.A 9000 Bq radioactive source 60 Co has been utilized to make the experiment and results came that when keeping other conditions same,the height of poly methyl methacrylate(PMMA)light guider changes from 12 mm to 40 mm and the energy resolutions varied from 72.3%to63.5% ***,another contrast experiment was made to decide whether plastic scintillator with light guiders or integrated chamfer can get better energy *** conclusion the plastic scintillator with integrated chamfer got 55.0%.Through the study of adding light guider or chamfer to plastic scintillator,the gamma energy resolution has been improved greatly from 72.3%to 55.0%.

关键词： energy resolution plastic scintillator light guider energy spectrum

Characteristics of the CsI:Tl scintillator Crystal for X-Ray Imaging Applications

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Materials Sciences and Applications 2018年第2期9卷 268-280页

作者： Maria da Conceicao Costa Pereira Tufic Madi Filho Jose Roberto Berretta Carlos Henrique de Mesquita Nuclear and Energy Research Institute—IPEN/CNEN-SP Sao PauloBrazil

scintillators are high-density luminescent materials that convert X-rays to visible light. Thallium doped cesium iodide (CsI:Tl) scintillation materials are widely used as converters for X-rays into visible light, with very high conversion efficiency of 64.000 optical photons/MeV. CsI:Tl crystals are commercially available, but, the possibility of developing these crystals into different geometric shapes, meeting the need for coupling the photosensor and reducing cost, makes this material very attractive for scientific research. The objective of this work was to study the feasibility of using radiation sensors, scintillators type, developed for use in imaging systems for X-rays. In this paper, the CsI:Tl scintillator crystal with nominal concentration of the 10-3 M was grown by the vertical Bridgman technique. The imaging performance of CsI:Tl scintillator was studied as a function of the design type and thickness, since it interferes with the light scattering and, hence, the detection efficiency plus final image resolution. The result of the diffraction X-ray analysis in the grown crystals was consistent with the pattern of a face-centered cubic (fcc) crystal structure. Slices 25 × 2 × 3 mm3 (length, thickness, height) of the crystal and mini crystals of 1 × 2 × 3 mm3 (length, thickness, height) were used for comparison in the imaging systems for X-rays. With these crystals scintillators, images of undesirable elements, such as metals in food packaging, were obtained. One-dimensional array of photodiodes and the photosensor CCD (Coupled Charge Device) component were used. In order to determine the ideal thickness of the slices of the scintillator crystal CsI:Tl, Monte Carlo method was used.

关键词： Crystal Growth scintillator X-Ray Imaging Systems Photodiodes Coupled Charge Device

The Influences of Inorganic scintillator Optical Fiber Radiation Dosimeter in Some Conditions

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Optics and Photonics Journal 2017年第8期7卷 81-85页

作者： Zhuang Qin Yaosheng Hu Yu Ma Wenhui Zhao Weimin Sun Tianci Xie Chuntong Jiang Daxin Zhang Ziyin Chen Boran Wang He Tian Elfed Lewis Key Lab of In-fiber Integrated Optics Ministry Education of China Harbin Engineering University Harbin China Comprehensive Cancer Center First Affiliated Hospital of Harbin Medical University Harbin China Harbin YIAOMI Technology Development Co. Ltd Harbin China College of Science Northeast Forestry University Harbin China Optical Fibre Sensors Research Centre University of Limerick Castletroy Limerick Ireland

In order to meet the increasing demands of modern radiotherapy, real time in-vivo dose measurement has recently attracted significant attention. A small, flexible optical fiber radiation dosimeter, with high signal-to-noise ratio (SNR) that employs inorganic scintillator materials is presented. In this paper, some properties are investigated under special conditions, such as saturation properties when the intensity of the X-Ray is increased and the influence of the temperature of the environment. These properties are important to practical considerations if the sensor is to be successfully deployed in-vivo.

关键词： Optical Fiber Sensor Radiation Dosimetry Inorganic scintillator Materials

5-31 Plastic scintillator Detector Calibration Circuit for DAMPE

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IMP & HIRFL Annual Report 2015年第1期 255-256页

作者： Yang Haibo Su Hong 不详

A new satellite – that will help humanity to unravel the mysteries of the “Dark Matter” – was launched on Thursday Dec. 7. 2015 by China. The launch of the DAMPE satellite took place at 00:12 UTC at the Jiuquan Satellite Launch Center. The new satellite will run in a sun-synchronous orbit with an altitude of 500 km and an inclination of 97.4? with 3 a lifetime.

关键词： Plastic scintillator Detector

5-29 Readout System for the Plastic scintillator Detector of DAMPE

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IMP & HIRFL Annual Report 2015年第1期 253-253页

作者： Kong Jie Yang Haibo Zhao Hongyun Zhang Jingzhe Niu Xiaoyang Su Hong 不详

The Dark Matter Particle Explorer (DAMPE) is a novel detection equipment for spaceborne astroparticle physics experiment, launched on 17 December 2015. The main scienti c objective of DAMPE is to detect electrons and photons in the range of 5 GeV10 TeV in order to identify possible Dark Matter signatures. It will also measure the ux of nuclei up to above 500 TeV with excellent energy resolution, which will bring new insights to the origin and propagation high energy cosmic rays[1]. The DAMPE detector, as shown in Fig. 1 is composed of a Plastic scintillator Detector array (PSD), a Silicon{Tungsten Tracker (STK), a BGO calorimeter, and a neutron detector(NUD).

关键词： scintillator Detector DAMPE

5-20 Preliminary Results of In-orbit test for Plastic scintillator Detector of DAMPE

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IMP & HIRFL Annual Report 2015年第1期 243-244页

作者： Zhang Yongjie Sun Zhiyu Yu Yuhong Zhou Yong Fang Fang Wang Zhaoming Chen Junlin Liu Jie 不详

As a key subdetector of dark matter particles explorer(DAMPE), Plastic scintillator Detector(PSD) play an important role in distinguishing electrons and photons events and probing heavy ion species up to Z=20[1]. DAMPE satellite was launched on Dec.17th2015 successfully, after that DAMPE powered up for front end electronics(FEEs) and for photomultiplier tubes(PMTs) with high voltage of payload on Dec.20th and Dec.24th, respectively.

关键词： scintillator Detector DAMPE

5-2 Development of a Multi-layer scintillator Telescope for the External Target Experiments

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IMP & HIRFL Annual Report 2014年第1期 212-213页

作者： Yan Duo Sun Zhiyu Yue Ke Wang Shitao Zhang Xueheng Yu Yuhong Chen Junling Fang Fang Zhou Yong Tang Shuwen Sun Yu Wang Zhaomin 不详

A new ΔE-E telescope has been constructed at the external target hall of CSRm[? ]. It is composed of 7 layers ofCsI(Tl) crystals. For each crystal, 4 photomultiplier tubes (PMTs) is coupled to the truncated corners for collectingscintillation light. Each crystal has an active area of 50 mm 50 mm, and the thickness of the crystals are between5 and 10 mm. According to the requests of different experiments, the combination and the ordering of the layerscould be different. In order to achieve good uniformity of light collection, the dressing of each crystal was carefullychosen. The first three layers of the crystals are coated with ESR film, and the others are packed with 7 m Al-Foil.

关键词： Development scintillator Telescope

Optimized online filter stack spectrometer for ultrashort X-ray pulses

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Nuclear Science and Techniques 2024年第5期35卷 85-98页

作者： Jia-Xing Wen Ge Ma Ming-Hai Yu Yu-Chi Wu Yong-Hong Yan Shao-Yi Wang Huai-Zhong Gao Lu-Shan Wang Yu-Gang Zhou Qiang Li Yue Yang Fang Tan Xiao-Hui Zhang Jie Zhang Wen-Bo Mo Jing-Qin Su Wei-Min Zhou Yu-Qiu Gu Ming Zeng Zong-Qing Zhao Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterCAEPMianyang 621900China Department of Engineering Physics Tsinghua UniversityBeijing 100084China Key Laboratory of Particle and Radiation Imaging(Tsinghua University) Ministry of EducationBeijing 100084China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010China

Currently,with the advent of high-repetition-rate laser-plasma experiments,the demand for online diagnosis for the X-ray spectrum is increasing because the laser-plasma-generated X-ray spectrum is very important for characterizing electron dynamics and *** this study,scintillators and silicon PIN(P-type–intrinsic-N-type semiconductor)diodes were used to construct a wideband online filter stack *** X-ray sensor and filter arrangement was optimized using a genetic algorithm to minimize the condition number of the response ***,the unfolding error was significantly reduced based on numerical *** detector responses were quantitatively calibrated by irradiating the scintillator and PIN diode with various nuclides and comparing the measuredγ-ray peaks.A prototype 15-channel spectrometer was developed by integrating an X-ray detector with front-and back-end *** prototype spectrometer could record X-ray pulse signals at a repetition rate of 1 ***,an optimized spectrometer was employed to record the real-time spectra of laser-driven bremsstrahlung *** optimized spectrometer offers a compact solution for spectrum diagnostics of ultrashort X-ray pulses,exhibiting improved accuracy in terms of spectrum measurements and repetition rates,and could be widely used in next-generation high-repetition-rate high-power laser facilities.

关键词： Filter stack spectrometer Laser plasma diagnostics X-ray diagnostics scintillator PIN diode

Development of novel rare earth doped fluoride and oxide scintillators for two-dimensional imaging

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Journal of Rare Earths 2011年第12期29卷 1178-1182页

作者： A.Yoshikawa T.Yanagida Y.Yokota K.Kamada N.Kawaguchi K.Fukuda A.Yamazaki K.Watanabe A.Uritani T.Iguchi G.Boulon M.Nikl Institute for Materials Research Tohoku University New Industry Creation Hatchery Center Tohoku University R&D Center Tokuyama CorporationShibuya 3-ChomeShibuya-ku Nagoya University Furo-choChikusa-ku Physical Chemistry of Luminescent Materials(LPCML) University of Lyon Institute of Physics AS CR

Two topics were focused. The first one was about the gamma-ray scintillator, Pr^3＋：Lu3Al5O12 （LuAG）. The second one was about neutron scintillator, Ce^3＋：^6LiCaAlF6 and Eu^2＋：^6LiCaAlF6 （^6LiCAF）. Those scintillators have been developed very recently for modem imaging applications in the medical and homeland security fields. In both cases, the rare earth ions are playing the crucial role as emission centers. Pr^3＋ in LuAG provided fast 5d→4f transition providing noticeably shorter decay time than that of Ce^3＋. Among several candidate hosts, LuAG showed the best performance. Bulk crystal growth, basic scintillation properties, two-dimensional gamma-ray imaging and positron emission mammography （PEM） application were demonstrated. Due to the international situation, the homeland security was compromized by illicit traffic of explosives, drugs, nuclear materials, etc. and the ways to its improvement became an important R＆D topic. For this purpose the Ce and Eu doped LiCAF appeared competitive candidates. Especially, when substitution of 3He neutron detectors was considered, the discrimination ability of gamma-ray from alpha-ray was important. Bulk crystal growth, basic scintillation properties and two-dimensional neutron imaging were demonstrated.

关键词： scintillator gamma-ray detection neutron detection oxide fluoride Ce, Eu rare earth