Radiation chemistry of high energy carbon, neon and argon ions: Effects of nuclear fragmentation

1985 ◽  
Vol 94 (4) ◽  
pp. 241-250 ◽  
Author(s):  
A. Appleby ◽  
E. A. Christman
Keyword(s):  
Radiation Chemistry ◽  
High Energy ◽  
Nuclear Fragmentation ◽  
Argon Ions

Radiation Chemistry of High-Energy Carbon, Neon, and Argon Ions: Molecular Hydrogen Yields

1989 ◽  
Vol 118 (3) ◽  
pp. 401 ◽  
Author(s):  
A. Appleby ◽  
E. A. Christman ◽  
M. Jayko
Keyword(s):  
Molecular Hydrogen ◽  
Radiation Chemistry ◽  
High Energy ◽  
Argon Ions

scholarly journals Radiation Chemistry of High-Energy Carbon, Neon, and Argon Ions: Hydrated Electron Yields

1986 ◽  
Vol 106 (3) ◽  
pp. 300 ◽  
Author(s):  
A. Appleby ◽  
E. A. Christman ◽  
M. Jayko
Keyword(s):  
Radiation Chemistry ◽  
High Energy ◽  
Hydrated Electron ◽  
Argon Ions

Radiation Chemistry of High-Energy Carbon, Neon, and Argon Ions: Hydroxyl Radical Yields

1985 ◽  
Vol 104 (3) ◽  
pp. 263 ◽  
Author(s):  
A. Appleby ◽  
E. A. Christman ◽  
M. Jayko
Keyword(s):  
Hydroxyl Radical ◽  
Radiation Chemistry ◽  
High Energy ◽  
Argon Ions

scholarly journals Modification of ethylene-norbornene copolymer by Gamma irradiation

2006 ◽  
Vol 60 (11-12) ◽  
pp. 311-315 ◽  
Author(s):  
Zorica Kacarevic-Popovic ◽  
Bojana Secerov ◽  
Milena Marinovic-Cincovic ◽  
Zoran Nedic ◽  
Slobodan Jovanovic
Keyword(s):  
Gamma Irradiation ◽  
Radiation Chemistry ◽  
High Energy ◽  
Spectrophotometric Analysis ◽  
New Combination ◽  
Polymeric Systems ◽  
New Class ◽  
Radiation Induced ◽  
Dsc Method ◽  
Induced Changes

The possibility of modifying polyethylene and many other polymers with high energy radiation has led to many useful applications. Due to their new combination of properties and the shortage of experimental data, the radiolysis of a new class of materials, cyclo-olefin copolymers (COC), polymerised from norbornene and ethylene using metallocene catalysts, is of great interest to the study of radiation chemistry and the physics of polymeric systems. Ethylenenorbornene copolymer, pristine and containing an antioxidant were subjected to gamma irradiation in the presence of air and in water. The irradiated copolymer was studied using IR and UV-vis spectrophotometric analysis. The radiation-induced changes in the molecular structure were correlated to changes in the glass transition temperature measured by the DSC method.

Direct Measurement of Ion Beam Induced, Nanoscale Roughening of GaN

2005 ◽  
Vol 864 ◽  
Author(s):  
Bentao Cui ◽  
P. I. Cohen ◽  
A. M. Dabiran
Keyword(s):  
Ion Beam ◽  
High Energy ◽  
Surface Relaxation ◽  
Surface Roughening ◽  
High Energy Electron ◽  
Force Microscopy ◽  
Atomic Force ◽  
Continuum Equation ◽  
Argon Ions ◽  
Nanoscale Patterns

AbatractThe formation of ion induced nanoscale patterns such as ripple, dots or pores can be described by a linear continuum equation consisting of a surface roughening term due to curvature-dependent sputtering or asymmetric attachment of vacancies, and a surface smoothing term due to thermal or ion-induced diffusion. By studying ion-induced dimple volume change using atomic force microscopy, we show a method to measure the ion-roughening coefficient. Using this method, we found the roughening coefficient í was 45 nm2/sec at 730K for initial ion etchings with 300 eV Argon ions. Cathodoluminescence measurements indicated Ga-vacancy formation during ion bombardment. The activation energy for surface relaxation after ion etching was about 0.12 eV as measured by reflection high energy electron diffraction.

scholarly journals Physical advantages of particles: protons and light ions

2020 ◽  
Vol 93 (1107) ◽  
pp. 20190428 ◽  
Author(s):  
Oliver Jäkel
Keyword(s):  
Energy Loss ◽  
Biological Effects ◽  
Ion Beam ◽  
National Laboratory ◽  
Carbon Ions ◽  
Nuclear Fragmentation ◽  
Depth Dose ◽  
Light Ions ◽  
Argon Ions ◽  
First Time

Proton and ion beam therapy has been introduced in the Lawrence Berkeley National Laboratory in the mid-1950s, when protons and helium ions have been used for the first time to treat patients. Starting in 1972, the scientists at Berkeley also were the first to use heavier ions (carbon, oxygen, neon, silicon and argon ions). The first clinical ion beam facility opened in 1994 in Japan and since then, the interest in radiotherapy with light ion beams has been increasing slowly but steadily, with 13 centers in clinical operation in 2019. All these centers are using carbon ions for clinical application. The article outlines the differences in physical properties of various light ions as compared to protons in view of the application in radiotherapy. These include the energy loss and depth dose properties, multiple scattering, range straggling and nuclear fragmentation. In addition, the paper discusses differences arising from energy loss and linear energy transfer with respect to their biological effects. Moreover, the paper reviews briefly the existing clinical data comparing protons and ions and outlines the future perspectives for the clinical use of ions like oxygen and helium.

Nuclear fragmentation of high-energy heavy-ion beams in water

1996 ◽  
Vol 17 (2) ◽  
pp. 87-94 ◽  
Author(s):  
D Schardt ◽  
I Schall ◽  
H Geissel ◽  
H Irnich ◽  
G Kraft ◽  
...  
Keyword(s):  
Heavy Ion ◽  
High Energy ◽  
Ion Beams ◽  
Nuclear Fragmentation
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