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Journal articles on the topic 'Gamma-rays imaging'

Author: Grafiati

Published: 22 February 2025

Last updated: 31 July 2025

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1

Koshikawa, N., Y. Kikuchi, S. Uno, et al. "Proposal and demonstration of a novel SPECT for high-precision gamma-ray imaging." Journal of Instrumentation 20, no. 07 (2025): C07057. https://doi.org/10.1088/1748-0221/20/07/c07057.

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Abstract In nuclear medicine, there is a growing demand for imaging the pharmacokinetics of various therapeutic drugs. Although there are promising radiopharmaceuticals that emit gamma rays of several hundred keV, imaging devices offering high contrast and spatial resolution in this energy range have not yet been developed. Compton cameras perform imaging in high-energy regions, including several hundred keV and even higher than MeV; however, their spatial resolution is relatively low. Single-photon emission computed tomography (SPECT) offers high spatial resolution for imaging with X-rays and

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Koshikawa, N., A. Omata, M. Masubuchi, et al. "Activation imaging of drugs with hybrid Compton camera: A proof-of-concept study." Applied Physics Letters 121, no. 19 (2022): 193701. http://dx.doi.org/10.1063/5.0116570.

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The visualization of drugs is essential for cancer treatment. Although several methods for visualizing drugs have been proposed, a versatile method that can be easily applied to various drugs has not yet been established. Therefore, we propose “activation imaging,” in which a drug is irradiated with thermal neutrons and becomes radioactive, enabling visualization using emitted x rays and/or gamma rays. Activation imaging does not require the conjugation of specific tracers with drugs. Therefore, it can be easily applied to a variety of drugs, drug carriers (e.g., metal nanoparticles), and cont

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Zarifmahmoudi, Leili, and Ramin Sadeghi. "Scattered gamma rays." Nuclear Medicine Communications 36, no. 7 (2015): 755–56. http://dx.doi.org/10.1097/mnm.0000000000000324.

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Uenomachi, M., K. Shimazoe, and H. Takahashi. "Double photon coincidence crosstalk reduction method for multi-nuclide Compton imaging." Journal of Instrumentation 17, no. 04 (2022): P04001. http://dx.doi.org/10.1088/1748-0221/17/04/p04001.

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Abstract Compton imaging based on Compton scattering kinematics has the potential to visualize multi-nuclides by discriminating the total energy of Compton scattering and photoelectric absorption events. This feature enables us to perform multi-tracer imaging that reflects different functional information in nuclear medicine, resulting in a definitive diagnosis and being useful for biological and medical research. One of the challenges with multi-nuclide imaging is the crosstalk artifacts caused by scattered photons of higher energy gamma-rays. In this study, we investigated the potential bene

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Yamamoto, Seiichi, Hiroshi Watabe, Kohei Nakanishi, et al. "A triple-imaging-modality system for simultaneous measurements of prompt gamma photons, prompt x-rays, and induced positrons during proton beam irradiation." Physics in Medicine & Biology 69, no. 5 (2024): 055012. http://dx.doi.org/10.1088/1361-6560/ad25c6.

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Abstract Objective. Prompt gamma photon, prompt x-ray, and induced positron imaging are possible methods for observing a proton beam’s shape from outside the subject. However, since these three types of images have not been measured simultaneously nor compared using the same subject, their advantages and disadvantages remain unknown for imaging beam shapes in therapy. To clarify these points, we developed a triple-imaging-modality system to simultaneously measure prompt gamma photons, prompt x-rays, and induced positrons during proton beam irradiation to a phantom. Approach. The developed trip

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Uenomachi, Mizuki, Kenji Shimazoe, and Hiroyuki Takahashi. "A double photon coincidence detection method for medical gamma-ray imaging." Bio-Algorithms and Med-Systems 18, no. 1 (2022): 120–26. http://dx.doi.org/10.2478/bioal-2022-0080.

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Abstract Cascade nuclides emit two or more gamma rays successively through an intermediate state. The coincidence detection of cascade gamma rays provides several advantages in gamma-ray imaging. In this review article, three applications of the double photon coincidence method are reviewed. Double-photon emission imaging with mechanical collimators and Compton double-photon emission imaging can identify radioactive source positions with their angular-resolving detectors, and reduce the crosstalk between nuclides. In addition, a novel method of coincidence Compton imaging is proposed by taking

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Tian, B. B., B. Jiang, H. T. Jing, and M. F. Yan. "Monte Carlo simulation study of a novel neutron resonance radiography method for oxygen identification in oxides and composite materials." Journal of Instrumentation 19, no. 09 (2024): T09002. http://dx.doi.org/10.1088/1748-0221/19/09/t09002.

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Abstract A novel imaging mode of neutron resonance radiography for the identification and mapping of oxygen element is firstly proposed based on the Back-n beamline at CSNS. The method utilizes a 10B-enriched conversion layer that converts transmitted neutrons to gamma rays. The emitted characteristic 478-keV prompt gamma rays are then collimated by a pinhole device and imaged. The energy-selective operation of transmitted neutrons via time-of-flight (TOF) measurement is performed by detecting 478-keV prompt gamma rays as a function of neutron TOF. This work shows the viability of the proposed

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van der Marel, J., and B. Cederwall. "Collimatorless imaging of gamma rays with help of gamma-ray tracking." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 471, no. 1-2 (2001): 276–80. http://dx.doi.org/10.1016/s0168-9002(01)01007-5.

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Sun, Y. K., H. T. Jing, B. B. Tian, X. L. Gao, and X. Y. Yang. "Research on proton beam spot imaging based on pixelated gamma detector." Journal of Instrumentation 17, no. 02 (2022): P02033. http://dx.doi.org/10.1088/1748-0221/17/02/p02033.

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Abstract The secondary particles from the spallation target of the China Spallation Neutron Source are mainly gammas and neutrons, which are related to the incident proton. The reconstruction of the proton beam spot could be implemented based on the distribution of the positions of secondary gammas or neutrons. The methods of pinhole imaging and Compton imaging are developed by measuring the position distribution of gammas based on the pixelated detector. The secondary gammas could be detected by the pixelated gamma detector directly. The neutron can be identified by detecting the characterist

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Yamamoto, Seiichi, Tomohiro Yamashita, Yusuke Kobashi, et al. "Simultaneous imaging of prompt gamma photons and prompt X-rays during irradiation of proton beams to human torso phantom at clinical dose level." Journal of Instrumentation 18, no. 07 (2023): P07046. http://dx.doi.org/10.1088/1748-0221/18/07/p07046.

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Abstract Although both prompt gamma photon and prompt X-ray imaging are promising methods for observing a beam shape and estimating the range of the beam from outside a subject, the images using these two methods have not been compared under realistic conditions such as in a human torso phantom. To clarify the imaging capability of prompt gamma photon and prompt X-ray imaging, simultaneous imaging with these methods was conducted during irradiation by proton beams to a human torso phantom at clinical dose level. After a human torso phantom was set on the bed of a proton therapy system, proton

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Li, Y., P. Gong, X. Tang, et al. "DOI correction for gamma ray energy reconstruction based on energy segment in 3D position-sensitive CdZnTe detectors." Journal of Instrumentation 17, no. 03 (2022): T03004. http://dx.doi.org/10.1088/1748-0221/17/03/t03004.

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Abstract The amplitude of the induced signal in 3D CdZnTe detector depends on the depth of interaction (DOI). Therefore, calibrating the detector by using DOI correction technology plays a crucial role in improving the energy resolution of the detectors to gamma rays. The current DOI correction method focuses on the single energy gamma rays, and its application to multiple energy gamma-rays are not found. In this study, we propose an improved energy correction algorithm with excellent correction results in the multiple energy gamma-ray detection. In the experiment, the DOI correction factors o

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Saariokari, S., P. Dendooven, M. Laassiri, and J. E. Brücken. "Nuclear fuel imaging using position-sensitive detectors." Journal of Instrumentation 20, no. 03 (2025): C03012. https://doi.org/10.1088/1748-0221/20/03/c03012.

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Abstract We are evaluating the performance of a Passive Gamma Emission Tomography (PGET) device [1] equipped with 3D position-sensitive cadmium zinc telluride (CZT) gamma-ray detectors when used for inspecting spent nuclear fuel assemblies (SFAs). Before their disposal in a geological repository, SFAs undergo verification using the PGET device, which was developed under the guidance of the IAEA and approved by the IAEA for safeguards inspections. Recent advancements in imaging detector technology may offer a method to extend the capabilities of such devices beyond standard safeguards applicati

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Aprile, E., A. Curioni, K. L. Giboni, M. Kobayashi, U. G. Oberlack, and S. Zhang. "Compton imaging of MeV gamma-rays with the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT)." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 593, no. 3 (2008): 414–25. http://dx.doi.org/10.1016/j.nima.2008.05.039.

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Das, Biswajit, R. Palit, R. Donthi, et al. "Development of a position-sensitive fast scintillator (LaBr₃(Ce)) detector setup for gamma-ray imaging application." EPJ Web of Conferences 253 (2021): 11005. http://dx.doi.org/10.1051/epjconf/202125311005.

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We have characterized a Cerium doped Lanthanum Bromide (LaBr3(Ce) ) crystal coupled with the position-sensitive photo-multiplier system for the gamma-ray imaging application. One can use this detector set-up for the scanning of high purity germanium detectors for pulse shape analysis in gamma-ray spectroscopy experiments and the image formation of an object by Compton back-scattering . The sensor has been tested for energy, timing and position information of the gamma-rays interacting within the detector crystal. The GEANT4 simulation results are consistent with the experimental results. We ha

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Monkhoev, R., M. Ternovoy, I. Astapov, et al. "Geant4 simulation of the Tunka-Grande experiment." Journal of Physics: Conference Series 2103, no. 1 (2021): 012001. http://dx.doi.org/10.1088/1742-6596/2103/1/012001.

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Abstract The Tunka-Grande array is part of a single experimental complex, which also includes the Tunka-133 and TAIGA-HiScORE (High Sensitivity COsmic Rays and gamma Explorer) wide-angle Cherenkov arrays, TAIGA-IACT array (Imaging Atmospheric Cherenkov Telescope) and TAGA-MUON scintillation array. This complex is located in the Tunka Valley (Buryatia Republic, Russia), 50 km from Lake Baikal. It is designed to study the energy spectrum and the mass composition of charged cosmic rays in the energy range 100 TeV - 1000 PeV, to search for diffuse gamma rays above 100 TeV and to study local source

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Looker, Q., L. C. Stonehill, M. S. Wallace, et al. "Demonstration of imaging via backscattering of annihilation gamma rays." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 615, no. 3 (2010): 295–300. http://dx.doi.org/10.1016/j.nima.2010.01.078.

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Sagisaka, Yuri, Yasuyuki Takahashi, Shota Hosokawa, et al. "Acquisition Conditions for Lu-177 DOTATATE Imaging." Radiation 4, no. 1 (2024): 17–25. http://dx.doi.org/10.3390/radiation4010002.

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We investigated imaging conditions for the distribution of lutetium oxodotreotide (Lu-177 DOTATATE) in the body during peptide receptor radionuclide therapy for neuroendocrine tumor (NET). We investigated imaging conditions using gamma rays emitted from the radionuclide. The gamma rays had energy peaks at 113 and 208 keV and characteristic X-rays at 56 keV. Image quality was compared by utilizing a combination of low–medium-energy general-purpose (LMEGP) and medium-energy general-purpose (MEGP) collimators. This study included the measurement of total spatial resolution (Full Width at Half Max

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Buuck, M., A. Mishra, E. Charles, et al. "Low-energy Electron-track Imaging for a Liquid Argon Time-projection-chamber Telescope Concept Using Probabilistic Deep Learning." Astrophysical Journal 942, no. 2 (2023): 77. http://dx.doi.org/10.3847/1538-4357/aca329.

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Abstract The GammaTPC is an MeV-scale single-phase liquid argon time-projection-chamber gamma-ray telescope concept with a novel dual-scale pixel-based charge-readout system. It promises to enable a significant improvement in sensitivity to MeV-scale gamma rays over previous telescopes. The novel pixel-based charge readout allows for imaging of the tracks of electrons scattered by Compton interactions of incident gamma rays. The two primary contributors to the accuracy of a Compton telescope in reconstructing an incident gamma-ray’s original direction are its energy and position resolution. In

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Takada, Atsushi, Taito Takemura, Kei Yoshikawa, et al. "First Observation of the MeV Gamma-Ray Universe with Bijective Imaging Spectroscopy Using the Electron-tracking Compton Telescope on Board SMILE-2+." Astrophysical Journal 930, no. 1 (2022): 6. http://dx.doi.org/10.3847/1538-4357/ac6103.

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Abstract MeV gamma-rays provide a unique window for the direct measurement of line emissions from radioisotopes, but observations have made little significant progress since COMPTEL on board the Compton Gamma-ray Observatory (CGRO). To observe celestial objects in this band, we are developing an electron-tracking Compton camera (ETCC) that realizes both bijective imaging spectroscopy and efficient background reduction gleaned from the recoil-electron track information. The energy spectrum of the observation target can then be obtained by a simple ON–OFF method using a correctly defined point-s

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Haga, Y. Karasawa, S. Kumazawa, and N. Niimura. "Gamma-ray sensitivity and shielding of a neutron imaging plate." Journal of Applied Crystallography 32, no. 5 (1999): 878–82. http://dx.doi.org/10.1107/s0021889899005701.

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The energy dependence of gamma-ray sensitivity of a neutron imaging plate (NIP) has been measured. The gamma-ray sensitivity is equivalent to one half that of a thermal neutron at a gamma-ray energy less than 300 keV, and 1/40 at greater than 300 keV. The shielding of the NIP, by lead, from gamma rays in the experimental hall of the reactor JRR-3M of the Japan Atomic Energy Research Institute (JAERI) was measured. It was found that lead of thickness 40 mm is sufficient to reduce the gamma-ray background to 1/10 on a normalized scale. Covering the NIP with lead foil of thickness 1 mm results in

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Adriani, O., Y. Akaike, K. Asano, et al. "CALET Search for Electromagnetic Counterparts of Gravitational Waves during the LIGO/Virgo O3 Run." Astrophysical Journal 933, no. 1 (2022): 85. http://dx.doi.org/10.3847/1538-4357/ac6f53.

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Abstract The CALorimetric Electron Telescope (CALET) on the International Space Station consists of a high-energy cosmic-ray CALorimeter (CAL) and a lower-energy CALET Gamma-ray Burst Monitor (CGBM). CAL is sensitive to electrons up to 20 TeV, cosmic-ray nuclei from Z = 1 through Z ∼ 40, and gamma rays over the range 1 GeV–10 TeV. CGBM observes gamma rays from 7 keV to 20 MeV. The combined CAL-CGBM instrument has conducted a search for gamma-ray bursts (GRBs) since 2015 October. We report here on the results of a search for X-ray/gamma-ray counterparts to gravitational-wave events reported dur

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Sol, Helene. "Very High Energy gamma-rays from blazars." Proceedings of the International Astronomical Union 9, S304 (2013): 119–24. http://dx.doi.org/10.1017/s1743921314003524.

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AbstractThe extragalactic very high energy (VHE) gamma-ray sky is dominated at the moment by more than fifty blazars detected by the present imaging atmospheric Cherenkov telescopes (IACT), with a majority (about 90%) of high-frequency peaked BL Lac objects (HBL) and a small number of low-frequency peaked and intermediate BL Lac objects (LBL and IBL) and flat spectrum radio quasars (FSRQ). A significant variability is often observed, with time scales from a few minutes to months and years. The spectral energy distribution (SED) of these blazars typically shows two bumps from the radio to the T

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Ivanova, A. L., R. Monkhoev, I. Astapov, et al. "Tunka-Grande scintillation array: resent results." Journal of Physics: Conference Series 2156, no. 1 (2021): 012196. http://dx.doi.org/10.1088/1742-6596/2156/1/012196.

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Abstract Objectives of the TAIGA Astrophysical complex include the study of the flux of charged cosmic rays and diffuse gamma rays with energies above 100 TeV. This complex is located in the Tunka Valley about 50 km from Lake Baikal at the site of the Tunka-133 Cherenkov facility. TAIGA includes the TAIGA-HiSCORE wide-angle Cherenkov array, the network of Imaging Atmospheric Cherenkov Telescopes (TAIGA-IACT), the Tunka-Grande and TAIGA-Muon scintillation arrays. In this work, we present the results of an analysis of the joint events of the Tunka-Grande scintillation array and TAIGA-HiSCORE and

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Song, Y., M. Zhang, B. J. Duan, et al. "A high-speed radiation imaging system based on liquid scintillator filled capillary arrays." Review of Scientific Instruments 93, no. 3 (2022): 033702. http://dx.doi.org/10.1063/5.0066686.

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A high-speed radiation imaging system based on an image converter of liquid scintillator filled capillary arrays has been developed, which is sensitive to x rays, gamma rays, and neutrons. This imaging system has advantages of both high spatial resolution and high sensitivity because increasing the thickness of the image converter only leads to little deterioration on imaging resolution. The capillary arrays have dimensions of 150 mm diameter and 50 mm thickness, with 100 µm diameter of each capillary. The fluorescence decay time of the filled liquid scintillator based on the mixture of p-xyle

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Pestotnik, R., G. Razdevšek, R. Dolenec, et al. "Simulation study of a 50 ps panel TOF PET imager." Journal of Instrumentation 17, no. 12 (2022): C12010. http://dx.doi.org/10.1088/1748-0221/17/12/c12010.

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Abstract Positron emission tomography (PET) is one of the most important diagnostic tools in medicine, providing three-dimensional imaging of functional processes in the body. The method is based on detecting two gamma rays originating from the point of annihilation of the positron emitted by a radio-labeled agent and used to follow the human’s physiological processes. In Time-Of-Flight PET, gamma rays’ arrival time is measured in addition to their position. The coincidence timing resolution (CTR) of state-of-the-art scanners is between 200 ps and 500 ps FWHM, which can significantly improve t

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Zhang, Changqing, Liang Sheng, Zhaohui Song, et al. "Experimental Demonstration of a Tunable Energy-Selective Gamma-Ray Imaging System Based on Recoil Electrons." Sensors 24, no. 12 (2024): 3736. http://dx.doi.org/10.3390/s24123736.

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The domain of gamma-ray imaging necessitates technological advancements to surmount the challenge of energy-selective imaging. Conventional systems are constrained in their dynamic focus on specific energy ranges, a capability imperative for differentiating gamma-ray emissions from diverse sources. This investigation introduces an innovative imaging system predicated on the detection of recoil electrons, addressing the demand for adjustable energy selectivity. Our methodology encompasses the design of a gamma-ray imaging system that leverages recoil electron detection to execute energy-selecti

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Geppert-Kleinrath, V., N. Hoffman, N. Birge, et al. "Gamma-ray imaging of inertial confinement fusion implosions reveals remaining ablator carbon distribution." Physics of Plasmas 30, no. 2 (2023): 022703. http://dx.doi.org/10.1063/5.0122938.

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The joint LANL/LLNL nuclear imaging team has acquired the first gamma-ray images of inertial confinement fusion implosions at the National Ignition Facility. The gamma-ray image provides crucial information to help characterize the inertially confined fuel and ablator assembly at stagnation, information that would be difficult to acquire from neutron or x-ray observations. Gamma imaging visualizes both gamma radiation emitted directly in deuterium–tritium (DT) fusion reactions as well as gamma rays produced when DT fusion neutrons scatter inelastically on carbon nuclei in the remaining ablator

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Dominis Prester, Dijana, Jan Ebr, Markus Gaug, et al. "Characterisation of the Atmosphere in Very High Energy Gamma-Astronomy for Imaging Atmospheric Cherenkov Telescopes." Universe 10, no. 9 (2024): 349. http://dx.doi.org/10.3390/universe10090349.

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Ground-based observations of Very High Energy (VHE) gamma rays from extreme astrophysical sources are significantly influenced by atmospheric conditions. This is due to the atmosphere being an integral part of the detector when utilizing Imaging Atmospheric Cherenkov Telescopes (IACTs). Clouds and dust particles diminish atmospheric transmission of Cherenkov light, thereby impacting the reconstruction of the air showers and consequently the reconstructed gamma-ray spectra. Precise measurements of atmospheric transmission above Cherenkov observatories play a pivotal role in the accuracy of the

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Hong, Seung Han, Wook Jae Yoo, Sang Hun Shin, et al. "Comparison of Optical and Scintillation Images Obtained by Using a Fiber-Optic Beta/Gamma Imaging Detector." Advanced Materials Research 1083 (January 2015): 137–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1083.137.

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We developed a fiber-optic beta/gamma imaging detector that can obtain the scintillating images for beta-or gamma-ray emitted from the radioisotope. To evaluate spatial resolution of proposed imaging detector, we obtained the optical images using USAF 1951 resolution target. And then, a modulation transfer function curve of the optical image was calculated. Also, we measured the scintillating images of Tl-204 and Cs-137 with information respecting the beta-and gamma-rays distribution. Finally, the intensities of scintillating light as a function of radioactivity were analyzed from the region o

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Aharonian, F., F. Ait Benkhali, J. Aschersleben, et al. "Search for the evaporation of primordial black holes with H.E.S.S." Journal of Cosmology and Astroparticle Physics 2023, no. 04 (2023): 040. http://dx.doi.org/10.1088/1475-7516/2023/04/040.

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Abstract Primordial Black Holes (PBHs) are hypothetical black holes predicted to have been formed from density fluctuations in the early Universe. PBHs with an initial mass around 1014–1015 g are expected to end their evaporation at present times in a burst of particles and very-high-energy (VHE) gamma rays. Those gamma rays may be detectable by the High Energy Stereoscopic System (H.E.S.S.), an array of imaging atmospheric Cherenkov telescopes. This paper reports on the search for evaporation bursts of VHE gamma rays with H.E.S.S., ranging from 10 to 120 seconds, as expected from the final st

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Hassan, Sajad Kareem Khalaf, Sajad Riad Kiridi Hajm, Muntazir Kazim Eabd Alamir Hasuwn, and Zahraa Jasim Mohammed. "DISEASES THAT ARE DIAGNOSED AND TREATED BY X-RAYS AND GAMMA RAYS." European Journal of Medical Genetics and Clinical Biology 1, no. 7 (2024): 43–60. http://dx.doi.org/10.61796/jmgcb.v1i7.713.

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rays have long been one of the most effective tools in detecting and diagnosing diseases because of their effective and practical properties in diagnosing the various diseases that appear in the x-ray image. Diagnostic x- rays are considered an examination carried out using To see the internal anatomy of the body Accurately and pinpoint the tiny spots. The x-ray beam passes through the body, and is absorbed in different quantities, depending on the absorption capacity of the material. Dense materials such as bones and metal appear in white in the x-ray image, while air in the lungs appears in

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Starič, M., S. Korpar, D. Korbar, and A. Stanovnik. "A thin multiwire proportional chamber for imaging with UV light, X-rays and gamma rays." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 323, no. 1-2 (1992): 91–96. http://dx.doi.org/10.1016/0168-9002(92)90274-8.

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Prester, D. Dominis, J. Sitarek, J. Becerra, et al. "MAGIC detection of sub-TEV emission from gravitationally lensed blazar QSO B0218+357." Proceedings of the International Astronomical Union 12, S324 (2016): 235–36. http://dx.doi.org/10.1017/s1743921317002344.

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The blazar QSO B0218+357 is the first gravitationally lensed blazar detected in the very high energy (VHE, E > 100 GeV) gamma-ray spectral range (Ahnen et al. 2016). It is gravitationally lensed by the intervening galaxy B0218+357G (zl = 0.68466 ± 0.00004, Carilli et al. 1993), which splits the blazar emission into two components, spatially indistinguishable by gamma-ray instruments, but separated by a 10-12 days delay. In July 2014 a flare from QSO B0218+357 was observed by the Fermi-LAT (Large Area Telescope, Atwood et al. 2009, Ackermann et al. 2012), and followed-up by the MAGIC (Major

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Carnes, Bruce A., and Thomas E. Fritz. "Continuous Irradiation of Beagles with Gamma Rays." Radiation Research 136, no. 1 (1993): 103. http://dx.doi.org/10.2307/3578646.

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Fang, Ke, Francis Halzen, and Dan Hooper. "Cascaded Gamma-Ray Emission Associated with the KM3NeT Ultrahigh-energy Event KM3-230213A." Astrophysical Journal Letters 982, no. 1 (2025): L16. https://doi.org/10.3847/2041-8213/adbbec.

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Abstract A neutrino-like event with an energy of ∼220 PeV was recently detected by the KM3NeT/ARCA telescope. If this neutrino comes from an astrophysical source or from the interaction of an ultrahigh-energy cosmic ray in the intergalactic medium, the ultrahigh-energy gamma rays that are coproduced with the neutrinos will scatter with the extragalactic background light, producing an electromagnetic cascade and resulting in emission at GeV-to-TeV energies. In this Letter, we compute the gamma-ray flux from this neutrino source considering various source distances and strengths of the intergala

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Tanimori, Toru. "Detection of TeV Gamma Rays from SN1006." Symposium - International Astronomical Union 188 (1998): 121–24. http://dx.doi.org/10.1017/s0074180900114585.

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In spite of the recent progress of high energy gamma-ray astronomy, there still remains quite unclear and important problem about the origin of cosmic rays. Supernova remnants (SNRs) are the favoured site for cosmic rays up to 1016 eV, as they satisfy the requirements such as an energy input rate. But direct supporting evidence is sparse. Recently intense non-thermal X-ray emission from the rims of the Type Ia SNR SN1006 (G327.6+14.6) has been observed by ASCA (Koyama et al. 1995)and ROSAT (Willingale et al. 1996), which is considered, by attributing the emission to synchrotron radiation, to b

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Martin, J. B., G. F. Knoll, D. K. Wehe, et al. "A ring Compton scatter camera for imaging medium energy gamma rays." IEEE Transactions on Nuclear Science 40, no. 4 (1993): 972–78. http://dx.doi.org/10.1109/23.256695.

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Fisher, T. R., J. W. Hamilton, J. D. Hawley, J. R. Kilner, M. J. Murphy, and G. H. Nakano. "Imaging of gamma rays with the WINKLER high-resolution germanium spectrometer." IEEE Transactions on Nuclear Science 37, no. 3 (1990): 1483–89. http://dx.doi.org/10.1109/23.57405.

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Lemoine-Goumard, Marianne. "Gamma-ray observations of supernova remnants." Proceedings of the International Astronomical Union 9, S296 (2013): 287–94. http://dx.doi.org/10.1017/s1743921313009605.

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AbstractIn the past few years, gamma-ray astronomy has entered a golden age. At TeV energies, only a handful of sources were known a decade ago, but the current generation of ground-based imaging atmospheric Cherenkov telescopes has increased this number to more than one hundred. At GeV energies, the Fermi Gamma-ray Space Telescope has increased the number of known sources by nearly an order of magnitude in its first 2 years of operation. The recent detection and unprecedented morphological studies of gamma-ray emission from shell-type supernova remnants is of great interest, as these analyses

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Vasiljević, Jana, and Bo Cederwall. "Performance Evaluation of an Imaging Radiation Portal Monitor System." Applied Sciences 12, no. 18 (2022): 9001. http://dx.doi.org/10.3390/app12189001.

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An organic scintillator-based radiation portal monitor (RPM) prototype system with imaging capabilities has been developed based on the neutron–gamma emission tomography technique. The technique enables rapid detection and precise location of small amounts of special nuclear materials, such as plutonium, using time and energy correlations between fast neutrons and gamma rays from spontaneous fission with low false-alarm rates. These capabilities, in addition to state-of-the-art detection of various gamma-emitting sources, enables the novel imaging RPM concept to efficiently address global secu

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A. M Issa, Shams, Antoaneta Ene, and Hesham M. H. Zakaly. "Evaluating the Effectiveness of Tellurium-Molybdenum Oxide Glass Systems for Radiation Shielding Protection." Multidisciplinary Materials Chronicles 1, no. 1 (2024): 19–29. http://dx.doi.org/10.62184/mmc.jmmc110020242.

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The present investigation examined TeO2–MeO3 glasses with different compositions for their ability to absorb γ-rays using the Phy-X and FLUKA Code, respectively. The study covered energies ranging from 0.015 to 15 MeV, where several parameters such as effective atomic number (Zeff), free path mean (GMFP), mass attenuation coefficient (GMAC), macroscopic cross-section (GLAC), and half-value levels were analyzed (GHVL). Glass composite composed of 80% TeO2 and 20% MoO3 was found to have the lowest GLAC content among the tested samples. GHVL = 0.055 cm was the half-value of the 80TeO2–20MoO3 glas

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Omori, Y., S. Inoue, T. Otsuka, Y. Nagamatsu, A. Sorimachi, and T. Ishikawa. "REDUCTION IN AMBIENT GAMMA DOSE RATE FROM RADIOCESIUM DUE TO SNOW COVER." Radiation Protection Dosimetry 184, no. 3-4 (2019): 510–13. http://dx.doi.org/10.1093/rpd/ncz091.

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Abstract In the present study, variations in ambient gamma dose rate associated with snow cover were examined in a radioactive-contaminated site in Fukushima Prefecture, Japan. The ambient gamma dose rates decreased with increasing snow depth. The reduction trends were different between fresh snow (0.1–0.2 g/cm3) and granular snow (0.3–0.4 g/cm3) depending on snow density. Snow cover water content (snow water equivalent) calculated from snow depth and density was a key parameter governing the reduction in the ambient gamma dose rate. The ambient gamma dose rates reduced to 0.6 and 0.5 at 4 g/c

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Zhang, Xi, Qiangqiang Xie, Siwei Xie, Xin Yu, Jianfeng Xu, and Qiyu Peng. "A Novel Portable Gamma Radiation Sensor Based on a Monolithic Lutetium-Yttrium Oxyorthosilicate Ring." Sensors 21, no. 10 (2021): 3376. http://dx.doi.org/10.3390/s21103376.

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Portable radiation detectors are widely used in environmental radiation detection and medical imaging due to their portability feature, high detection efficiency, and large field of view. Lutetium-yttrium oxyorthosilicate (LYSO) is a widely used scintillator in gamma radiation detection. However, the structure and the arrangement of scintillators limit the sensitivity and detection accuracy of these radiation detectors. In this study, a novel portable sensor based on a monolithic LYSO ring was developed for the detection of environmental radiation through simulation, followed by construction a

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Ando, Koichi, Yukari Yoshida, Ryoichi Hirayama, Sachiko Koike, and Naruhiro Matsufuji. "Dose- and LET-dependent changes in mouse skin contracture up to a year after either single dose or fractionated doses of carbon ion or gamma rays." Journal of Radiation Research 63, no. 2 (2022): 221–29. http://dx.doi.org/10.1093/jrr/rrab123.

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Abstract Time dependence of relative biological effectiveness (RBE) of carbon ions for skin damage was investigated to answer the question of whether the flat distribution of biological doses within a Spread-Out Bragg peak (SOBP) which is designed based on in vitro cell kill could also be flat for in vivo late responding tissue. Two spots of Indian ink intracutaneously injected into the legs of C3H mice were measured by calipers. An equieffective dose to produce 30% skin contraction was calculated from a dose–response curve and used to calculate the RBE of carbon ion beams. We discovered skin

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Poirier, Yannick, Matthew D. Belley, Mark W. Dewhirst, Terry T. Yoshizumic, and Julian D. Down. "Transitioning from Gamma Rays to X Rays for Comparable Biomedical Research Irradiations: Energy Matters." Radiation Research 193, no. 6 (2020): 506. http://dx.doi.org/10.1667/rade-20-00039.1.

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Sato, Yuri, Kaori Obayashi, Ryo Yamazaki, Kohta Murase, and Yutaka Ohira. "Off-axis jet scenario for early afterglow emission of low-luminosity gamma-ray burst GRB 190829A." Monthly Notices of the Royal Astronomical Society 504, no. 4 (2021): 5647–55. http://dx.doi.org/10.1093/mnras/stab1273.

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ABSTRACT Recently, ground-based Imaging Atmospheric Cherenkov Telescopes have reported the detection of very-high-energy (VHE) gamma-rays from some gamma-ray bursts (GRBs). One of them, GRB 190829A, was triggered by the Swift satellite, and about 2 × 104 s after the burst onset the VHE gamma-ray emission was detected by H.E.S.S. with ∼5σ significance. This event had unusual features of having much smaller isotropic equivalent gamma-ray energy than typical long GRBs and achromatic peaks in X-ray and optical afterglow at about 1.4 × 103 s. Here, we propose an off-axis jet scenario that explains

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Fariña, Luis, Keerthana Lathika, Giulio Lucchetta, et al. "Design and Performance of a Low-Energy Gamma-Ray Trigger System for HERD." Instruments 8, no. 2 (2024): 31. http://dx.doi.org/10.3390/instruments8020031.

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The High Energy cosmic-Radiation Detection (HERD) facility has been proposed as one of the main experiments on board the Chinese space station. HERD is scheduled to be installed around 2027 and to operate for at least 10 years. Its main scientific goals are the study of the cosmic ray spectrum and composition up to the PeV energy range, indirect dark matter detection, and all-sky gamma-ray observation above 100 MeV. HERD features a novel design in order to optimize its acceptance per weight, with a central 3D imaging calorimeter surrounded on top and on its four lateral sides by complementary

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Chowdhury, Talal Ahmed, Saquib Hassan, Jahid Hossain, Salah Nasri, and Mahmud Ashraf Shamim. "Probing the Dark Matter of the Three-loop Radiative Neutrino Mass Generation Model with the Cherenkov Telescope Array." Journal of Physics: Conference Series 2156, no. 1 (2021): 012076. http://dx.doi.org/10.1088/1742-6596/2156/1/012076.

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Abstract We investigate the prospect of detecting the Dark Matter (DM) candidate in the three-loop radiative neutrino mass generation model extended with large electroweak multiplets of the Standard Model (SM) gauge group, at the future imaging atmospheric Cherenkov telescope known as the Cherenkov Telescope Array (CTA). We find that the addition of such large electroweak multiplets leads to a sizable Sommerfeld enhanced annihilation of the DM with O(TeV) mass, into the SM gauge bosons which results in continuum and line-like spectra of very high energy (VHE) gamma-rays, and therefore becomes

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FitzGerald, J. G. M., L. W. Burggraf, B. R. Kowash, and E. L. Hull. "A Modulating Liquid Collimator for Coded Aperture Adaptive Imaging of Gamma-Rays." IEEE Transactions on Nuclear Science 60, no. 3 (2013): 2300–2307. http://dx.doi.org/10.1109/tns.2013.2259052.

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Ferrando, P., G. Comby, P. Goret, N. Petrou, A. Tabary, and A. Zadra. "A cherenkov imaging technique for the detection of high energy gamma-rays." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 260, no. 2-3 (1987): 501–8. http://dx.doi.org/10.1016/0168-9002(87)90123-9.

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