Surface structure of silicon carbide irradiated with helium ions with monoenergy and continuous energy distributions

1982 ◽  
Vol 53 (12) ◽  
pp. 8697-8705 ◽  
Author(s):  
S. Miyagawa ◽  
Y. Ato ◽  
Y. Miyagawa
Keyword(s):  
Silicon Carbide ◽  
Surface Structure ◽  
Helium Ions ◽  
Energy Distributions ◽  
Continuous Energy

Tailoring the Surface Structure of Silicon Carbide Support for Copper Catalyzed Ethanol Dehydrogenation

ChemCatChem ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 481-487 ◽  
Author(s):  
Meng‐Yue Li ◽  
Wen‐Duo Lu ◽  
Lei He ◽  
Ferdi Schüth ◽  
An‐Hui Lu
Keyword(s):  
Silicon Carbide ◽  
Surface Structure ◽  
Ethanol Dehydrogenation

scholarly journals Realistic dosimetry for studies on biological responses to X-rays and γ-rays

2017 ◽  
Vol 58 (5) ◽  
pp. 729-736 ◽  
Author(s):  
Mehrdad Shahmohammadi Beni ◽  
Dragana Krstic ◽  
Dragoslav Nikezic ◽  
Kwan Ngok Yu
Keyword(s):  
Ionization Chamber ◽  
Photoelectric Effect ◽  
Calibration Coefficient ◽  
Water Medium ◽  
X Rays ◽  
Energy Distributions ◽  
Continuous Energy ◽  
Biological Responses ◽  
Photon Dose ◽  
Γ Rays

ABSTRACT A calibration coefficient R (= DA/DE) for photons was employed to characterize the photon dose in radiobiological experiments, where DA was the actual dose delivered to cells and DE was the dose recorded by an ionization chamber. R was determined using the Monte Carlo N-Particle version 5 (MCNP-5) code. Photons with (i) discrete energies, and (ii) continuous-energy distributions under different beam conditioning were considered. The four studied monoenergetic photons had energies E = 0.01, 0.1, 1 and 2 MeV. Photons with E = 0.01 MeV gave R values significantly different from unity, while those with E > 0.1 MeV gave R ≈ 1. Moreover, R decreased monotonically with increasing thickness of water medium above the cells for E = 0.01, 1 or 2 MeV due to energy loss of photons in the medium. For E = 0.1 MeV, the monotonic pattern no longer existed due to the dose delivered to the cells by electrons created through the photoelectric effect close to the medium–cell boundary. The continuous-energy distributions from the X-Rad 320 Biological Irradiator (voltage = 150 kV) were also studied under three different beam conditions: (a) F0: no filter used, (b) F1: using a 2 mm-thick Al filter, and (c) F2: using a filter made of (1.5 mm Al + 0.25 mm Cu + 0.75 mm Sn), giving mean output photon energies of 47.4, 57.3 and 102 keV, respectively. R varied from ~1.04 to ~1.28 for F0, from ~1.13 to ~1.21 for F1, and was very close to unity for F2.

Evolution of defects in silicon carbide implanted with helium ions

2014 ◽  
Vol 326 ◽  
pp. 345-350 ◽  
Author(s):  
Chonghong Zhang ◽  
Yin Song ◽  
Yitao Yang ◽  
Chunlan Zhou ◽  
Long Wei ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Helium Ions

The surface structure of silicon carbide

1937 ◽  
Vol 33 ◽  
pp. 337 ◽  
Author(s):  
G. I. Finch ◽  
H. Wilman
Keyword(s):  
Silicon Carbide ◽  
Surface Structure
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