Effect of Cascade Remnants on Freely Migrating Defects in Cu -1 % Au Alloys

1995 ◽  
Vol 396 ◽  
Author(s):  
A. Iwase ◽  
L. E. Rehn ◽  
P. M. Baldo ◽  
L. Funk
Keyword(s):  
Heavy Ions ◽  
Ion Irradiation ◽  
Ion Beam ◽  
Heavy Ion ◽  
The Other ◽  
Inert Gas ◽  
Heavy Ion Irradiation ◽  
Simultaneous Irradiation ◽  
Radiation Induced ◽  
Cu Ions

AbstractThe effects of cascade remnants on Freely Migrating Defects (FMD) were studied by measuring Radiation-Induced Segregation (RIS) in Cu-l%Au at 400°C during simultaneous irradiation with 1.5-MeV He and (400-800)-keV heavy ions (Ne, Ar or Cu). The large RIS observed during 1.5-MeV He-only irradiation was dramatically suppressed under simultaneous heavy ion irradiation. For Cu simultaneous irradiation, the suppression disappeared immediately after the Cu irradiation ceased, while for simultaneous inert gas (Ne or Ar) irradiation, the suppression persisted after the ion beam was turned off. These results demonstrate that the displacement cascades created by heavy ions introduce additional annihilation sites, which reduce the steady-state FMD concentrations. As the cascade remnants produced by Cu ions are thermally unstable at 400°C, the RIS suppression occurs only during simultaneous irradiation. On the other hand, the inert gas atoms which accumulate in the specimen apparently stabilize the cascade remnants, allowing the suppression to persist.

Ion beam-mixing effects in nearly lattice-matched AlInN/GaN heterostructures by swift heavy ion irradiation

2012 ◽  
Vol 167 (7) ◽  
pp. 506-511 ◽  
Author(s):  
G. Devaraju ◽  
S. V.S. Nageswara Rao ◽  
N. Srinivasa Rao ◽  
V. Saikiran ◽  
T. K. Chan ◽  
...  
Keyword(s):  
Ion Irradiation ◽  
Ion Beam ◽  
Heavy Ion ◽  
Ion Beam Mixing ◽  
Swift Heavy Ion Irradiation ◽  
Heavy Ion Irradiation ◽  
Mixing Effects ◽  
Swift Heavy Ion ◽  
Lattice Matched

scholarly journals Significance of Heavy-Ion Beam Irradiation-Induced Avermectin B1a Production by EngineeredStreptomyces avermitilis

2017 ◽  
Vol 2017 ◽  
pp. 1-13
Author(s):  
Shu-Yang Wang ◽  
Yong-Heng Bo ◽  
Xiang Zhou ◽  
Ji-Hong Chen ◽  
Wen-Jian Li ◽  
...  
Keyword(s):  
Ion Irradiation ◽  
Ion Beam ◽  
Heavy Ion ◽  
Streptomyces Avermitilis ◽  
Specific Productivity ◽  
Original Strain ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Heavy Ion Irradiation ◽  
Heavy Ion Beam

Heavy-ion irradiation technology has advantages over traditional methods of mutagenesis. Heavy-ion irradiation improves the mutation rate, broadens the mutation spectrum, and shortens the breeding cycle. However, few data are currently available regarding its effect onStreptomyces avermitilismorphology and productivity. In this study, the influence of heavy-ion irradiation onS. avermitiliswhen cultivated in approximately 10 L stirred-tank bioreactors was investigated. The specific productivity of the avermectin (AVM) B1a-producing mutantS. avermitilis147-G58 increased notably, from 3885 to 5446 μg/mL, approximately 1.6-fold, compared to the original strain. The mycelial morphology of the mutant fermentation processes was microscopically examined. Additionally, protein and metabolite identification was performed by using SDS-PAGE, 2- and 3-dimensional electrophoresis (2DE and 3DE). The results showed that negative regulation gene deletion of mutants led to metabolic process upregulating expression of protein and improving the productivity of an avermectin B1a. The results showed that the heavy-ion beam irradiation dose that corresponded to optimal production was well over the standard dose, at approximately 80 Gy at 220 AMeV (depending on the strain). This study provides reliable data and a feasible method for increasing AVM productivity in industrial processes.

Accommodation of Uranium into the Garnet Structure

2002 ◽  
Vol 713 ◽  
Author(s):  
Sergey V. Yudintsev ◽  
Marya I. Lapina ◽  
Alexander G. Ptashkin ◽  
Tatiana S. Ioudintseva ◽  
Satoshi Utsunomiya ◽  
...  
Keyword(s):  
Phase Composition ◽  
Ion Irradiation ◽  
High Capacity ◽  
Heavy Ion ◽  
Uranium Content ◽  
The Other ◽  
Garnet Structure ◽  
Heavy Ion Irradiation ◽  
Si Doped ◽  
Air Medium

ABSTRACTOne promising host for actinide wastes is garnet-type phases of general formula AVIII3BVI 2[XO4]3. To determine the isomorphic capacity of garnet for uranium, the CaO – Fe2O3 – Al2O3 – SiO2 – ZrO2 – Gd2O3 – UO2 system was studied. Experiments were performed in air medium at 1400 – 1500 °C and 1 atm. The garnets have high capacity for Gd and Zr, while incorporation of U was found to be greatly dependent on the phase composition. Uranium content decreased from 18 wt.% in Ca-Zr-Fe garnet to 0.6 wt.% in Si-doped phases. Heavy ion irradiation (1.0 MeV Kr++) experiments were carried out for a garnet with maximal U content, (Ca2.7U0.3)VIII(Zr1.7Fe0.3)VI(Al1.1Fe1.9)IVO12. Amorphization dose of the phase was equal to 1.63×1014 ions/cm2 that is close to the other actinide hosts, such as pyrochlore Gd2Ti2O7.

Swift heavy ion irradiation of ZnO nanoparticles embedded in silica: Radiation-induced deoxidation and shape elongation

2013 ◽  
Vol 103 (20) ◽  
pp. 203106 ◽  
Author(s):  
H. Amekura ◽  
N. Okubo ◽  
N. Ishikawa ◽  
D. Tsuya ◽  
K. Mitsuishi ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Swift Heavy Ion Irradiation ◽  
Heavy Ion Irradiation ◽  
Swift Heavy Ion ◽  
Radiation Induced

scholarly journals NADPH Oxidase Activation Contributes to Heavy Ion Irradiation–Induced Cell Death

Dose-Response ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 155932581769969 ◽  
Author(s):  
Yupei Wang ◽  
Qing Liu ◽  
Weiping Zhao ◽  
Xin Zhou ◽  
Guoying Miao ◽  
...  
Keyword(s):  
Cell Death ◽  
Nadph Oxidase ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Ros Generation ◽  
Heavy Ion Irradiation ◽  
Radiation Induced ◽  
Heavy Ion Radiation ◽  
Nox Family ◽  
Nadph Oxidase Activation

Increased oxidative stress plays an important role in heavy ion radiation–induced cell death. The mechanism involved in the generation of elevated reactive oxygen species (ROS) is not fully illustrated. Here we show that NADPH oxidase activation is closely related to heavy ion radiation–induced cell death via excessive ROS generation. Cell death and cellular ROS can be greatly reduced in irradiated cancer cells with the preincubation of diphenyleneiodium, an inhibitor of NADPH oxidase. Most of the NADPH oxidase (NOX) family proteins (NOX1, NOX2, NOX3, NOX4, and NOX5) showed increased expression after heavy ion irradiation. Meanwhile, the cytoplasmic subunit p47phox was translocated to the cell membrane and localized with NOX2 to form reactive NADPH oxidase. Our data suggest for the first time that ROS generation, as mediated by NADPH oxidase activation, could be an important contributor to heavy ion irradiation–induced cell death.

scholarly journals Effects of the Surface on Displacement Cascades Produced by Heavy-Ion Irradiation of Ni3Al and Cu3Au

1996 ◽  
Vol 439 ◽  
Author(s):  
S. Müller ◽  
M. L. Jenkins ◽  
C. Abromeit ◽  
H. Wollenberger
Keyword(s):  
Ion Irradiation ◽  
Incident Angle ◽  
Ion Beam ◽  
Heavy Ion ◽  
Small Population ◽  
Dislocation Loops ◽  
Near Surface ◽  
Ion Energy ◽  
Heavy Ion Irradiation ◽  
Transmission Electron

AbstractStereo transmission electron microscopy has been used to characterise the distribution in depth of disordered zones and associated dislocation loops in the ordered alloys Ni3Al and Cu3Au after heavy ion irradiation, most extensively for Ni3Al irradiated with 50 keV Ta+ ions at a temperature of 573 K. The Cu3Au specimen was irradiated with 50 keV Ni+ ions at an incident angle of 45° at a temperature of 373 K. In Ni3Al the defect yield, i.e. the probability for a disordered zone to contain a loop was found to be strongly dependent on the depth of the zone in the foil, varying from about 0.7 for near-surface zones to about 0.2 in the bulk. The sizes and shapes of disordered zones were only weakly dependent on depth, except for a small population of zones very near the surface which were strongly elongated parallel to the incident ion beam. In Cu3Au the surface had a smaller but still significant effect on the defect yield. The dependence of the tranverse disordered zone diameter d on ion energy E for Ta+ irradiation of NiA was found to follow a relationship d = k1, E1/α with k, = 2.4 ± 0.4 and α = 3.3 ± 0.4. A similar relationship with the same value of α is valid for a wide variety of incident ion/target combinations found in the literature.

Ion beam mixing of ZnO/SiO2 and Sb/Ni/Si interfaces under swift heavy ion irradiation

2002 ◽  
Vol 91 (3) ◽  
pp. 1129-1134 ◽  
Author(s):  
Saskia Kraft ◽  
Beate Schattat ◽  
Wolfgang Bolse ◽  
Siegfried Klaumünzer ◽  
Felix Harbsmeier ◽  
...  
Keyword(s):  
Ion Irradiation ◽  
Ion Beam ◽  
Heavy Ion ◽  
Ion Beam Mixing ◽  
Swift Heavy Ion Irradiation ◽  
Heavy Ion Irradiation ◽  
Swift Heavy Ion

Swift Heavy Ion Irradiation Induced Effects in Si/SiOx Multi-Layered Films and Nanostructures

2009 ◽  
Vol 1181 ◽  
Author(s):  
Jurgen W Gerlach ◽  
C. Patzig ◽  
W. Assmann ◽  
A. Bergmaier ◽  
Th. Höche ◽  
...  
Keyword(s):  
Ion Irradiation ◽  
Incidence Angle ◽  
Ion Beam ◽  
Heavy Ion ◽  
Ion Beam Sputtering ◽  
Elastic Recoil ◽  
Swift Heavy Ion Irradiation ◽  
Heavy Ion Irradiation ◽  
Swift Heavy Ion ◽  
Glancing Angle

AbstractAmorphous Si/SiOx multi-layered films and nanostructures were deposited on Si substrates by the glancing angle deposition technique using Ar ion beam sputtering of a Si sputter target in an intermittent oxygen atmosphere at room temperature. The chemical composition of the samples was characterized by time-of-flight secondary ion mass spectrometry, as well as - for quantifying these first results - by elastic recoil detection analysis using a 200 MeV Au ion beam. The latter method was found to lead to a significant alteration of the sample morphology, resulting in the formation of complex nanometric structures within the layer stacks. In order to investigate these swift heavy ion irradiation induced effects in more detail, a series of experiments was conducted to determine the dominating influences. For this purpose, specific glancing angle deposited multilayered films and nanostructures were irradiated to constant ion fluence with the same 200 MeV Au ion beam at different incidence angles. Scanning electron microscopy of the stacks before and after swift Au ion irradiation revealed considerable changes in film morphology and density as a function of the ion incidence angle, such as an increased porosity of the silicon layers, accompanied by a layer swelling. In contrast, the SiOx layers did not show such effects, but exhibited clearly visible swift heavy ion tracks. The observed effects became stronger with decreasing ion incidence angle.

scholarly journals Plant Mutation Breeding with Heavy Ion Irradiation at IMP

2016 ◽  
Vol 8 (5) ◽  
pp. 34 ◽  
Author(s):  
Xicun Dong ◽  
Xia Yan ◽  
Wenjian Li
Keyword(s):  
Ion Irradiation ◽  
Biological Effects ◽  
Ion Beam ◽  
National Laboratory ◽  
Heavy Ion ◽  
Mutation Breeding ◽  
High Yield ◽  
Early Maturity ◽  
Heavy Ion Irradiation ◽  
Heavy Ion Beam

<p>The Heavy Ion Research Facility in Lanzhou (HIRFL) is one of the ion-beam acceleration facilities intensively used at IMP, founded as national laboratory and opened for user in world from 1992. Since then, a lot of experiments irradiated by heavy ion beam have been carried out in the HIRFL, including plant mutation breeding. In this review, the biological effects induced by heavy ions and their corresponding mechanisms were reported from the point of view of cytological, morphological and molecular levels. To date, a large number of mutants were isolated using heavy ion irradiation IMP, such as early maturity, flower color and shape, high yield and disease resistant. In conclusion, heavy ion beam irradiation is an efficient mutagen and has significant phenotypic variations in plant. Our research will be further focused on transformation of scientific and technological achievements and mutagenic mechanism of heavy ion beam on high plant at the molecular level in the recent future.</p>

Structural defects induced by heavy-ion irradiation in superconducting oxides

1993 ◽  
Vol 51 ◽  
pp. 1138-1139
Author(s):  
Yimei Zhu ◽  
H. Zhang ◽  
Z.X. Cai ◽  
R.C. Budhani ◽  
D.O. Welch ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Defect Formation ◽  
Ion Irradiation ◽  
Ion Beam ◽  
Amorphous Region ◽  
Heavy Ion ◽  
Microscopy Study ◽  
Dynamical Theory ◽  
Structural Defects ◽  
Hole Density

We studied the the structure and properties of high Tc superconductors using heavy ions. While irradiation of YBa2Cu3O7-δ (hereafter denoted as 123) with 300 MeV Au+24 and 276 MeV Ag+21 ions produces columns of amorphous tracks along the ion trajectories, such defects are only created occasionally during irradiation with 236 MeV Cu+18, and are not induced with 182 MeV Si+13. A comprehensive electron microscopy study of defect formation in Bi2Sr2Ca2Cu3Ox, and in oxygen-reduced and ozone-treated 123, shows that the degree of radiation damage (the size and the shape of the defect) by the heavy ions depends on: (a) the rate at which ions lose their energy in the target; (b) crystallographic orientations with respect to the incident ion-beam (Fig.1); (c) thermal conductivity and chemical state (eg. oxygen concentration of 123) of the sample, and (d) the extent of pre-existing defects in the crystal. Calculation and simulation of the strain contrast surrounding the amorphous column using two-beam dynamical theory agree well with the observations and suggest that the reduced hole density observed in the crystal near the amorphous region is mainly due to lattice distortion.

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