Results 111 to 120 of about 157,734 (293)

High Energy Emission of V404 Cygni during 2015 outburst with INTEGRAL/SPI: Spectral analysis issues and solutions [PDF]

arXiv, 2016
A strong outburst of the X-ray transient V404 Cygni (= GS2023-338) was observed in 2015 June/July up to a level of 50 Crab in the hard X-ray domain. At this level of photon flux, an instrument's behavior may be severely tested and some instrumental artifacts could affect the data analysis.
arxiv  

Time lag between prompt optical emission and gamma-rays in GRBs

, 2006
The prompt optical emission contemporaneous with the $\gamma$-rays from $\gamma$-ray bursts (GRBs) carries important information on the central engine and explosion mechanism. We study the time lag between prompt optical emission and $\gamma$-rays in GRB
Akerlof, Andersen, Barkov, Blake, Kulkarni, Li, Li, Liang, Meszaros, Rykoff, S. M. Tang, S. N. Zhang, Vestrand   +12 more
core   +1 more source

Monte Carlo modeling of radiation dose from radiation therapy with superficial x‐rays

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Introduction Superficial x‐rays (50–100 kVp) are used for treating non‐melanoma skin cancer and intraoperative radiation therapy (IORT). At these energies, the photoelectric effect significantly increases absorbed dose to bone compared to soft tissue.
Reham Barghash, Tiffany W. Martin, Amber R. Prebble, Del Leary   +3 more
wiley   +1 more source

Unveiling the Origin of the Fermi Bubbles

Galaxies, 2018
The Fermi bubbles, two giant structures above and below the Galactic center (GC), are among the most important discoveries of the Fermi Gamma-ray Space Telescope.
H.-Y. Karen Yang, Mateusz Ruszkowski, Ellen G. Zweibel   +2 more
doaj   +1 more source

Evaluation of dosimetric and spatial accuracy of a virtual cone technique for radiosurgery using linac‐integrated CBCT‐based polymer gel dosimetry

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose This study evaluates the dosimetric and geometric precision of a virtual cone technique using CBCT‐based polymer gel dosimetry, enabling radiation delivery, and imaging readout within an identical spatial coordinate system. Methods We created a C# script for a virtual cone technique that generates a treatment plan with 10 gantry arcs ...
Tenzin Kunkyab, Michael Lamey, Andrew Jirasek, Michael Kudla, Nathan Becker, Benjamin Mou, Derek Hyde   +6 more
wiley   +1 more source

Extragalactic Sources of TeV Gamma Rays: A Summary

, 2003
The development of techniques whereby gamma rays of energy 100 GeV and above can be studied from the ground, using indirect, but sensitive, techniques has opened up a new area of high energy photon astronomy.
Aharonian, Aharonian, Aharonian, Aharonian, Aharonian, Aharonian, Aharonian, Aharonian, Aharonian, Bicknell, Bignami, Boone, Boone, Bradbury, Buckley, Catanese, Chadwick, Costamante, Costamante, D Horan, Djannati-Atai, Djannati-Atai, Djannati-Atai, Gaidos, Giommi, Grindlay, Hartman, Hoffman, Holder, Horan, Itoh, Itoh, Kerrick, Krawczynski, Krennrich, Krennrich, Krennrich, Neshpor, Neshpor, Nishiyama, Petry, Pian, Punch, Quinn, Roberts, Samuelson, Swanenburg, T.C Weekes, Volk, Weekes   +49 more
core   +1 more source

Evaluation of the system accuracy of frameless stereotactic radiosurgery using a combination of cone beam CT, six degrees of freedom couch, and surface image‐guided systems

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose This study aims to evaluate the accuracy of the frameless linear accelerator‐based stereotactic radiosurgery (FSRS) system incorporating cone‐beam CT (CBCT), six degrees of freedom (6‐DoF) couch, room laser, and surface image‐guided (SG) systems.
Hao‐Wen Cheng, Jonathan Li, Sheng‐Hsuan Sun, Guanghua Yan, Chihray Liu   +4 more
wiley   +1 more source

Gamma-ray Bursts [PDF]

International Astronomical Union Colloquium, 2005
SummarySince their discovery in 1967 Gamma-ray bursts (GRBs) have been puzzling to astrophysicists. With the advent of a new generation of X–ray satellites in the late 90’s, it was possible to carry out deep multi-wavelength observations of the counterparts associated with the long duration GRBs class just within a few hours of occurrence, thanks to ...
openaire   +2 more sources

Shielding resources for four common radiopharmaceuticals utilized for imaging and therapy: Tc‐99m, F‐18, I‐131, and Lu‐177

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Introduction The use of radioactive materials in the United States has been tightly regulated by the Nuclear Regulatory Commission and other entities for many decades. In 2015, however, the Joint Commission began to require hospital‐based nuclear medicine departments to conduct shielding designs and evaluations for radioactive material areas ...
Michael Oumano, Richard Wendt, James Botti, Nathan Busse, David Hintenlang, Stephanie Leon, Kevin Little, Melissa Martin, Richard Massoth, Kenneth Matthews, Rameshwar Prasad, Sharon White, Jessica Clements   +12 more
wiley   +1 more source

Gamma radiation: A potential tool for abiotic stress mitigation and management of agroecosystem

Plant Stress, 2022
Context: Being sessile, it is impossible for the plants to evade from the unfavourable environmental conditions prevailing due to various abiotic stresses like heat, salinity, drought, flood, heavy metals, and high radiance amongst many others.
Priya Katiyar, Neha Pandey, S. Keshavkant   +2 more
doaj