The Experts below are selected from a list of 88584 Experts worldwide ranked by ideXlab platform
Jinsong Huang - One of the best experts on this subject based on the ideXlab platform.
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Halide lead perovskites for ionizing Radiation Detection
Nature Communications, 2019Co-Authors: Haotong Wei, Jinsong HuangAbstract:Halide lead perovskites have attracted increasing attention in recent years for ionizing Radiation Detection due to their strong stopping power, defect-tolerance, large mobility-lifetime (μτ) product, tunable bandgap and simple single crystal growth from low-cost solution processes. In this review, we start with the requirement of material properties for high performance ionizing Radiation Detection based on direct Detection mechanisms for applications in X-ray imaging and γ-ray energy spectroscopy. By comparing the performances of halide perovskites Radiation detectors with current state-of-the-art ionizing Radiation detectors, we show the promising features and challenges of halide perovskites as promising Radiation detectors.Halide lead perovskites have emerged recently as possible candidates for high performance Radiation detectors besides efficient solar cells. Here Wei et al. review the recent progress on perovskite based Radiation detectors and suggest that they may compete with the conventional counterparts.
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halide lead perovskites for ionizing Radiation Detection
Nature Communications, 2019Co-Authors: Haotong Wei, Jinsong HuangAbstract:Halide lead perovskites have attracted increasing attention in recent years for ionizing Radiation Detection due to their strong stopping power, defect-tolerance, large mobility-lifetime (μτ) product, tunable bandgap and simple single crystal growth from low-cost solution processes. In this review, we start with the requirement of material properties for high performance ionizing Radiation Detection based on direct Detection mechanisms for applications in X-ray imaging and γ-ray energy spectroscopy. By comparing the performances of halide perovskites Radiation detectors with current state-of-the-art ionizing Radiation detectors, we show the promising features and challenges of halide perovskites as promising Radiation detectors.
Craig S Levin - One of the best experts on this subject based on the ideXlab platform.
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investigation of optical property modulation based ionizing Radiation Detection method for pet two crossed polarizers based method
Nuclear Science Symposium and Medical Imaging Conference, 2019Co-Authors: Yuli Wang, Craig S Levin, Jianfeng XuAbstract:In this paper, a novel optical setup based on twocrossed-polarizers is introduced to achieve ionizing Radiation Detection, which is an easy-build-up setup with equivalent ionizing Radiation Detection ability as previous work [1], [2], [3]. The performance of our proposed setup with Lithium Niobate (LiNbO3) and Cadmium Telluride (CdTe) detector crystals was evaluated. The 511keV photons induced modulation signal could be detected using two-crossed-polarizer based method with LiNbO3 and CdTe as detector. Moreover, the strength of modulation signal is linear proportion with bias voltage before being saturated. Due to LiNbO3’s high resistivity (which could reduce the dark current), its modulation signal strength keeps increased trend after 2000V, while that signal of CdTe tended to be saturated at voltage higher than 1200V since CdTe with lower resistivity. Therefore, to improve the Detection sensitivity for 511keV, we could further increase the bias voltage for detector crystals (especially for detector with high resistivity).
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investigation of an optical amplification t echnique t o improve sensitivity of an optical property modulation based Radiation Detection method for pet
Nuclear Science Symposium and Medical Imaging Conference, 2017Co-Authors: Henry M Daghighian, Craig S LevinAbstract:The optical amplification effect achieved by adopting high quality factor (high-Q) optical resonant cavities has shown the ability to enable ultra-high sensitivity measurement for refractive index modulation. In this work, we investigate the usage of optical amplification effect for improving the Detection sensitivity for optical modulation-based Radiation Detection method for positron emission tomography (PET), with the ultimate goal to achieve individual annihilation photon Detection with significantly improved coincidence time resolution (CTR). We studied the Detection sensitivity of etalon cavities made of 50%, 90% and 95% reflection cavity mirrors, and compared the sensitivity to our previous spatial interference setup. We also studied the influence of optical concentration on the Detection sensitivity by using a focused probe laser beam aligned to intercept the interaction region of ionizing Radiation photons with the detector crystal. A Detection sensitivity boost of approximately two orders of magnitude has been observed using etalon cavity made of 95% reflection mirrors with 1mm diameter focused probe laser beam, compared to our previous spatial interference setup. The Detection speed is not affected by using high-Q cavities. This proves the potential of using the optical amplification effect to dramatically improve the Detection sensitivity for optical modulation-based Radiation Detection method for PET, with the ultimate goal to achieve individual 511keV photon Detection with ultrafast CTR.
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study of material properties important for an optical property modulation based Radiation Detection method for positron emission tomography
Journal of medical imaging, 2017Co-Authors: Henry M Daghighian, Craig S LevinAbstract:We compare the performance of two detector materials, cadmium telluride (CdTe) and bismuth silicon oxide (BSO), for optical property modulation-based Radiation Detection method for positron emission tomography (PET), which is a potential new direction to dramatically improve the annihilation photon pair coincidence time resolution. We have shown that the induced current flow in the detector crystal resulting from ionizing Radiation determines the strength of optical modulation signal. A larger resistivity is favorable for reducing the dark current (noise) in the detector crystal, and thus the higher resistivity BSO crystal has a lower (50% lower on average) noise level than CdTe. The CdTe and BSO crystals can achieve the same sensitivity under laser diode illumination at the same crystal bias voltage condition while the BSO crystal is not as sensitive to 511-keV photons as the CdTe crystal under the same crystal bias voltage. The amplitude of the modulation signal induced by 511-keV photons in BSO crystal is around 30% of that induced in CdTe crystal under the same bias condition. In addition, we have found that the optical modulation strength increases linearly with crystal bias voltage before saturation. The modulation signal with CdTe tends to saturate at bias voltages higher than 1500 V due to its lower resistivity (thus larger dark current) while the modulation signal strength with BSO still increases after 3500 V. Further increasing the bias voltage for BSO could potentially further enhance the modulation strength and thus, the sensitivity.
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a promising new mechanism of ionizing Radiation Detection for positron emission tomography modulation of optical properties
Physics in Medicine and Biology, 2016Co-Authors: Li Tao, Henry M Daghighian, Craig S LevinAbstract:Using conventional scintillation Detection, the fundamental limit in positron emission tomography (PET) time resolution is strongly dependent on the inherent temporal variances generated during the scintillation process, yielding an intrinsic physical limit for the coincidence time resolution of around 100 ps. On the other hand, modulation mechanisms of the optical properties of a material exploited in the optical telecommunications industry can be orders of magnitude faster. In this paper we borrow from the concept of optics pump-probe measurement to for the first time study whether ionizing Radiation can produce modulations of optical properties, which can be utilized as a novel method for Radiation Detection. We show that a refractive index modulation of approximately [Formula: see text] is induced by interactions in a cadmium telluride (CdTe) crystal from a 511 keV photon source. Furthermore, using additional radionuclide sources, we show that the amplitude of the optical modulation signal varies linearly with both the detected event rate and average photon energy of the Radiation source.
A. Monfardini - One of the best experts on this subject based on the ideXlab platform.
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Tunable sub-gap Radiation Detection with superconducting resonators
Superconductor Science and Technology, 2017Co-Authors: O. Dupré, A. Benoît, M. Calvo, A. Catalano, J. Goupy, C. Hoarau, T. Klein, K. Lecalvez, B. Sacépé, A. MonfardiniAbstract:We have fabricated planar amorphous indium oxide superconducting resonators (${T}_{{\rm{c}}}\sim 2.8$ K) that are sensitive to frequency-selective Radiation in the range of 7–10 GHz. Those values lay far below twice the superconducting gap that is worth about 200 GHz. The photon Detection consists in a shift of the fundamental resonance frequency. We show that the detected frequency can be adjusted by modulating the total length of the superconducting resonator. We attribute those observations to the excitation of higher-order resonance modes. The coupling between the fundamental lumped and the higher order distributed resonance is due to the kinetic inductance nonlinearity with current. These devices, that we have called sub-gap kinetic inductance detectors, are to be distinguished from the standard kinetic inductance detectors in which quasi-particles are generated when incident light breaks down Cooper pairs.
Haotong Wei - One of the best experts on this subject based on the ideXlab platform.
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Halide lead perovskites for ionizing Radiation Detection
Nature Communications, 2019Co-Authors: Haotong Wei, Jinsong HuangAbstract:Halide lead perovskites have attracted increasing attention in recent years for ionizing Radiation Detection due to their strong stopping power, defect-tolerance, large mobility-lifetime (μτ) product, tunable bandgap and simple single crystal growth from low-cost solution processes. In this review, we start with the requirement of material properties for high performance ionizing Radiation Detection based on direct Detection mechanisms for applications in X-ray imaging and γ-ray energy spectroscopy. By comparing the performances of halide perovskites Radiation detectors with current state-of-the-art ionizing Radiation detectors, we show the promising features and challenges of halide perovskites as promising Radiation detectors.Halide lead perovskites have emerged recently as possible candidates for high performance Radiation detectors besides efficient solar cells. Here Wei et al. review the recent progress on perovskite based Radiation detectors and suggest that they may compete with the conventional counterparts.
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halide lead perovskites for ionizing Radiation Detection
Nature Communications, 2019Co-Authors: Haotong Wei, Jinsong HuangAbstract:Halide lead perovskites have attracted increasing attention in recent years for ionizing Radiation Detection due to their strong stopping power, defect-tolerance, large mobility-lifetime (μτ) product, tunable bandgap and simple single crystal growth from low-cost solution processes. In this review, we start with the requirement of material properties for high performance ionizing Radiation Detection based on direct Detection mechanisms for applications in X-ray imaging and γ-ray energy spectroscopy. By comparing the performances of halide perovskites Radiation detectors with current state-of-the-art ionizing Radiation detectors, we show the promising features and challenges of halide perovskites as promising Radiation detectors.
Bruce W Wessels - One of the best experts on this subject based on the ideXlab platform.
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defect antiperovskite compounds hg3q2i2 q s se and te for room temperature hard Radiation Detection
Journal of the American Chemical Society, 2017Co-Authors: Oleg Y Kontsevoi, Constantinos C Stoumpos, Giancarlo Trimarchi, Saiful Islam, Zhifu Liu, Svetlana S Kostina, Sanjib Das, Joonil Kim, Wenwen Lin, Bruce W WesselsAbstract:The high Z chalcohalides Hg3Q2I2 (Q = S, Se, and Te) can be regarded as of antiperovskite structure with ordered vacancies and are demonstrated to be very promising candidates for X- and γ-ray semiconductor detectors. Depending on Q, the ordering of the Hg vacancies in these defect antiperovskites varies and yields a rich family of distinct crystal structures ranging from zero-dimensional to three-dimensional, with a dramatic effect on the properties of each compound. All three Hg3Q2I2 compounds show very suitable optical, electrical, and good mechanical properties required for Radiation Detection at room temperature. These compounds possess a high density (>7 g/cm3) and wide bandgaps (>1.9 eV), showing great stopping power for hard Radiation and high intrinsic electrical resistivity, over 1011 Ω cm. Large single crystals are grown using the vapor transport method, and each material shows excellent photo sensitivity under energetic photons. Detectors made from thin Hg3Q2I2 crystals show reasonable respons...
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photoconductivity in tl6si4 a novel semiconductor for hard Radiation Detection
Chemistry of Materials, 2013Co-Authors: Sandy L Nguyen, Zhifu Liu, Bruce W Wessels, Christos D Malliakas, John A Peters, Lidong Zhao, Maria Sebastian, Hosub Jin, Simon Johnsen, Arthur J FreemanAbstract:The chemical concept of lattice hybridization was applied to identify new chalcohalide compounds as candidates for X-ray and γ-ray Detection. Per this approach, compound semiconductor materials with high density and wide band gaps can be produced that can absorb and detect hard Radiation. Here, we show that the mixed chalcogenide–halide compound Tl6SI4 is a congruently melting, mechanically robust chalcohalide material with strong photoconductivity response and an impressive room-temperature figure of merit. Tl6SI4 crystallizes in the tetragonal P4/mnc space group, with a = 9.1758(13) A, c = 9.5879(19) A, V = 807.3(2) A3, and a calculated density of 7.265 g·cm–3. The new material requires a more simplified crystal growth compared to the leading system Cd0.9Zn0.1Te, which is the benchmark room-temperature hard Radiation detector material. We successfully synthesized Tl6SI4 crystals to produce detector-grade wafers with high resistivity values (∼1010 Ω·cm) and high-resolution Detection of X-ray spectra from...
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dimensional reduction a design tool for new Radiation Detection materials
Advanced Materials, 2011Co-Authors: John Androulakis, Bruce W Wessels, Sebastian C Peter, Hao Li, Christos D Malliakas, John A Peters, Jung Hwan Song, Arthur J Freeman, Mercouri G KanatzidisAbstract:John Androulakis , Sebastian C. Peter , Hao Li , Christos D. Malliakas , John A. Peters , Zhifu Liu , Bruce W W. essels , Jung-Hwan Song , Hosub Jin , Arthur J. reeman , F and Mercouri G. Kanatzidis *
