scholarly journals Radiation Damage Mechanisms of Monolayer-Protected Nanoparticles via TEM Analysis

2017 ◽  
Vol 121 (46) ◽  
pp. 26108-26116 ◽  
Author(s):  
Julio C. Azcárate ◽  
Mariano H. Fonticelli ◽  
Eugenia Zelaya
Keyword(s):  
Radiation Damage ◽  
Tem Analysis ◽  
Damage Mechanisms ◽  
Monolayer Protected Nanoparticles

scholarly journals Radiation damage mechanisms for luminescence in Eu-doped GaN

2007 ◽  
Vol 101 (5) ◽  
pp. 054902 ◽  
Author(s):  
J. W. Tringe ◽  
T. E. Felter ◽  
C. E. Talley ◽  
J. D. Morse ◽  
C. G. Stevens ◽  
...  
Keyword(s):  
Radiation Damage ◽  
Damage Mechanisms

A Modest Proposal for the Propagation of Information Concerning Radiation Damage in the TEM, and as Fodder for Pasturized Professors

2013 ◽  
Vol 21 (6) ◽  
pp. 70-72 ◽  
Author(s):  
Ray Egerton
Keyword(s):  
Radiation Damage ◽  
Spatial Resolution ◽  
Room Temperature ◽  
Threshold Value ◽  
Atomic Weight ◽  
Good Thing ◽  
Displacement Damage ◽  
Tem Analysis ◽  
Displacement Energy ◽  
Modest Proposal

For a beam-sensitive specimen, the spatial resolution of TEM analysis is limited by radiation damage, and it is obviously a good thing to minimize the amount of damage that occurs during a measurement. Knock-on displacement damage, which predominates in metals, can be reduced by lowering the accelerating voltage (ideally below a threshold value that depends on atomic weight and displacement energy). Ionization damage (radiolysis), which predominates in organic materials, is often ameliorated if the specimen is cooled below room temperature.

Radiation Effects in Ceramic Insulators

1994 ◽  
Vol 373 ◽  
Author(s):  
G P Pells
Keyword(s):  
Radiation Damage ◽  
Neutron Irradiation ◽  
Radiation Effects ◽  
Oxide Ceramics ◽  
Damage Mechanisms ◽  
Ceramic Insulators ◽  
Varying Mass

AbstractRadiation damage mechanisms in oxide ceramics are briefly discussed for irradiation by electrons, ions and neutrons. The effects of electron, ion and neutron irradiation on the evolution of the damage microstructure of MgO, A12O3 and MgAl2O4 are followed in detail. Particular attention is paid to differences in the microstructure produced by ions of varying mass and energy. The effects of damage microstructure on other properties are indicated.

scholarly journals Radiation damage to nucleoprotein complexes in macromolecular crystallography

2015 ◽  
Vol 22 (2) ◽  
pp. 213-224 ◽  
Author(s):  
Charles Bury ◽  
Elspeth F. Garman ◽  
Helen Mary Ginn ◽  
Raimond B. G. Ravelli ◽  
Ian Carmichael ◽  
...  
Keyword(s):  
Nucleic Acids ◽  
Radiation Damage ◽  
Diffraction Data ◽  
Dose Range ◽  
Computational Method ◽  
Large Field ◽  
Macromolecular Crystallography ◽  
Damage Mechanisms ◽  
X Ray ◽  
Nucleoprotein Complexes

Significant progress has been made in macromolecular crystallography over recent years in both the understanding and mitigation of X-ray induced radiation damage when collecting diffraction data from crystalline proteins. In contrast, despite the large field that is productively engaged in the study of radiation chemistry of nucleic acids, particularly of DNA, there are currently very few X-ray crystallographic studies on radiation damage mechanisms in nucleic acids. Quantitative comparison of damage to protein and DNA crystals separately is challenging, but many of the issues are circumvented by studying pre-formed biological nucleoprotein complexes where direct comparison of each component can be made under the same controlled conditions. Here a model protein–DNA complex C.Esp1396I is employed to investigate specific damage mechanisms for protein and DNA in a biologically relevant complex over a large dose range (2.07–44.63 MGy). In order to allow a quantitative analysis of radiation damage sites from a complex series of macromolecular diffraction data, a computational method has been developed that is generally applicable to the field. Typical specific damage was observed for both the protein on particular amino acids and for the DNA on, for example, the cleavage of base-sugar N1—C and sugar-phosphate C—O bonds. Strikingly the DNA component was determined to be far more resistant to specific damage than the protein for the investigated dose range. At low doses the protein was observed to be susceptible to radiation damage while the DNA was far more resistant, damage only being observed at significantly higher doses.

Radiation Damage Mechanisms In Scintillator Materials: Applications to BaF2 and CeF3

1994 ◽  
Vol 348 ◽  
Author(s):  
L. E. Halliburton ◽  
G. J. Edwards
Keyword(s):  
Low Temperature ◽  
Optical Absorption ◽  
Radiation Damage ◽  
Room Temperature ◽  
Epr Spectrum ◽  
Absorption Bands ◽  
Paramagnetic Resonance ◽  
Damage Mechanisms ◽  
Temperature Damage ◽  
F Centers

ABSTRACTResults from recent radiation damage studies in high quality BaF2 and CeF3 crystals are presented. Optical absorption and electron paramagnetic resonance (EPR) techniques are used to identify specific radiation damage mechanisms. Specific attention is given to the role of oxygen and hydrogen in the room temperature damage of BaF2. Also, Mn2+ ions are shown to change valence state in BaF2during room temperature irradiation. Numerous optical absorption bands are created in CeF3 during irradiations at low temperature. These bands are associated with electron traps (either F centers or Ce2+ ions) and they thermal anneal below room temperature. An EPR spectrum, assigned to F centers, is observed in low-temperature irradiated CeF3.

Radiation damage mechanisms in copper phthalocyanine and its chlorinated derivatives

1980 ◽  
Vol 5 (1-3) ◽  
pp. 195-208 ◽  
Author(s):  
W.R.K. Clark ◽  
J.N. Chapman ◽  
A.M. MacLeod ◽  
R.P. Ferrier
Keyword(s):  
Radiation Damage ◽  
Copper Phthalocyanine ◽  
Damage Mechanisms
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