An Electron Spin Resonance Study of High Energy Radiation Damage in Tetrapotassium Hexacyanoruthenate Trihydrate, K4Ru(II)(CN)6•3H2O

1972 ◽  
Vol 50 (2) ◽  
pp. 162-166 ◽  
Author(s):  
R. S. Eachus ◽  
F. G. Herring
Keyword(s):  
Room Temperature ◽  
Gamma Ray ◽  
Close Association ◽  
Liquid Nitrogen Temperature ◽  
High Energy ◽  
Electron Spin Resonance Study ◽  
Paramagnetic Species ◽  
High Energy Radiation ◽  
Spin Resonance ◽  
Gamma Ray Irradiation

Gamma-ray irradiation at 77 °K and X-ray irradiation at room temperature of single crystals of the diamagnetic tetrapotassium hexacyanoruthenate trihydrate have been shown to produce a number of interesting paramagnetic species. At room temperature the e.s.r. spectra can be interpreted in terms of the species [Ru(CN)5(NC)]5−. At liquid nitrogen temperature the species [Ru(CN)4(NC)2]5− is observed and the HCN− radical is produced in an environment which does not permit it to rapidly reorientate at 77 °K. The HCN− radical is believed to be in close association with a ruthenium(II) ion.

One-step synthesis of well-dispersed polypyrrole copolymers under gamma-ray irradiation

2021 ◽  
Vol 12 (5) ◽  
pp. 645-649
Author(s):  
Yu Gu ◽  
Yuqing Qiao ◽  
Yusen Meng ◽  
Ming Yu ◽  
Bowu Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gamma Ray ◽  
Gamma Ray Irradiation ◽  
One Step ◽  
First Time

Herein, we report for the first time the synthesis of polypyrrole copolymers with good solvent-dispersibility under gamma-ray irradiation at room temperature in air.

scholarly journals The gamma-ray irradiation sensitivity and dosimetric information instability of RADFET dosimeter

2013 ◽  
Vol 28 (4) ◽  
pp. 415-421 ◽  
Author(s):  
Milic Pejovic
Keyword(s):  
Threshold Voltage ◽  
Field Effect ◽  
Room Temperature ◽  
Gamma Ray ◽  
Field Effect Transistors ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Threshold Voltage Shift ◽  
Voltage Shift ◽  
Gamma Ray Irradiation

The gamma-ray irradiation sensitivity to radiation dose range from 0.5 Gy to 5 Gy and post-irradiation annealing at room and elevated temperatures have been studied for p-channel metal-oxide-semiconductor field effect transistors (also known as radiation sensitive field effect transistors or pMOS dosimeters) with gate oxide thicknesses of 400 nm and 1 mm. The gate biases during the irradiation were 0 and 5 V and 5 V during the annealing. The radiation and the post-irradiation sensitivity were followed by measuring the threshold voltage shift, which was determined by using transfer characteristics in saturation and reader circuit characteristics. The dependence of threshold voltage shift DVT on absorbed radiation dose D and annealing time was assessed. The results show that there is a linear dependence between DVT and D during irradiation, so that the sensitivity can be defined as DVT/D for the investigated dose interval. The annealing of irradiated metal-oxide-semiconductor field effect transistors at different temperatures ranging from room temperature up to 150?C was performed to monitor the dosimetric information loss. The results indicated that the dosimeters information is saved up to 600 hours at room temperature, whereas the annealing at 150?C leads to the complete loss of dosimetric information in the same period of time. The mechanisms responsible for the threshold voltage shift during the irradiation and the later annealing have been discussed also.

Magnetic resonance studies of metal–olefin complexes. I. Electron spin resonance spectra of γ-irradiated silver perchlorate cycloalkene complexes

1970 ◽  
Vol 48 (17) ◽  
pp. 2740-2744 ◽  
Author(s):  
D. R. Gee ◽  
K. E. Russell ◽  
J. K. S. Wan
Keyword(s):  
Electron Spin Resonance ◽  
Magnetic Resonance ◽  
Spin Density ◽  
Room Temperature ◽  
Paramagnetic Species ◽  
Magnetic Resonance Studies ◽  
Silver Perchlorate ◽  
Spin Resonance ◽  
The Stability ◽  
Polycrystalline Silver

Paramagnetic species have been detected in γ-irradiated polycrystalline silver perchlorate – cycloalkene complexes at room temperature and identified as Ag+ cycloalkenyl radicals, with spin density on Ag decreasing from 4.6 to 1.5% with increasing size of the cycloalkenyl ring. The extent of the spin density on Ag increases with the stability of the parent complexes.

scholarly journals High-energy astrophysics and the search for sources of gravitational waves

2018 ◽  
Vol 376 (2120) ◽  
pp. 20170294 ◽  
Author(s):  
P. T. O'Brien ◽  
P. Evans
Keyword(s):  
Gravitational Wave ◽  
Short Duration ◽  
Gamma Ray ◽  
New Technology ◽  
High Energy ◽  
Compact Objects ◽  
Wide Field ◽  
High Energy Radiation ◽  
Energy Radiation ◽  
Binary Mergers

The dawn of the gravitational-wave (GW) era has sparked a greatly renewed interest into possible links between sources of high-energy radiation and GWs. The most luminous high-energy sources—gamma-ray bursts (GRBs)—have long been considered as very likely sources of GWs, particularly from short-duration GRBs, which are thought to originate from the merger of two compact objects such as binary neutron stars and a neutron star–black hole binary. In this paper, we discuss: (i) the high-energy emission from short-duration GRBs; (ii) what other sources of high-energy radiation may be observed from binary mergers; and (iii) how searches for high-energy electromagnetic counterparts to GW events are performed with current space facilities. While current high-energy facilities, such as Swift and Fermi, play a crucial role in the search for electromagnetic counterparts, new space missions will greatly enhance our capabilities for joint observations. We discuss why such facilities, which incorporate new technology that enables very wide-field X-ray imaging, are required if we are to truly exploit the multi-messenger era. This article is part of a discussion meeting issue ‘The promises of gravitational-wave astronomy’.

scholarly journals Gamma-Ray Pulsar Emission Models

1996 ◽  
Vol 160 ◽  
pp. 315-322 ◽  
Author(s):  
Alice K. Harding
Keyword(s):  
Spectral Index ◽  
Gamma Ray ◽  
High Energy ◽  
Pulsar Emission ◽  
High Energy Radiation ◽  
X Ray ◽  
Gamma Ray Detectors ◽  
Emerging Patterns ◽  
Increased Sensitivity ◽  
Emission Models

AbstractWith the increased sensitivity of gamma-ray detectors on the Compton Gamma-Ray Observatory (CGRO) the number of presently known gamma-ray pulsars has grown. The new detections are beginning to provide clues to the origin of the high-energy radiation in the form of emerging patterns and correlations among observed quantities such as gamma-ray efficiency and spectral index vs. age. But there are still many questions about the location of the emission and its relation to the radio, optical and X-ray pulses. This paper will review models for gamma-ray emission from pulsars and will examine how well the detailed predictions of these models account for the existing observations.

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