Effects of MeV Ion Beam on Polymers

1996 ◽  
Vol 438 ◽  
Author(s):  
A. L. Evelyn ◽  
D. Ila ◽  
R. L. Zimmerman ◽  
K. Bhat ◽  
D. B. Poker ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Microprobe Analysis ◽  
Ion Beam ◽  
Electrical Conductance ◽  
Electronic Energy ◽  
Alpha Particles ◽  
Layered System ◽  
Nuclear Stopping ◽  
Resistivity Measurements ◽  
Film Polymer

AbstractThe electronic (εe) and nuclear (εa) stopping effects produced by 3.5 MeV and 5.0 MeV ion bombardment in polyvinylidine chloride (PVDC), polyethylene (PE) and polyethylene sulfide were studied and compared. To separate these effects we chose two bombardment energies and a thin film polymer stacking technique developed in house. The resulting stacked layered system consisting of each polymer was bombarded with 3.5 MeV and 5.0 MeV alpha particles. The layered system was selected such that the first few layers experience most of the effects of the electronic energy deposited and the last layer receives the effects of the nuclear stopping. The electrical conductance and the changes in the chemical structure were measured by direct resistivity measurements, Raman microprobe analysis, RBS, and FTIR. The post-irradiation characterization resolved the effects of the stopping powers on the polymer films.

scholarly journals Ion Beam Modification of PVDC and Pe Polymers

1995 ◽  
Vol 396 ◽  
Author(s):  
A. L. Evelyn ◽  
D. Ila ◽  
J. Fisher ◽  
D. B. Poker
Keyword(s):  
Chemical Structure ◽  
Microprobe Analysis ◽  
Ion Beam ◽  
Electronic Energy ◽  
Alpha Particles ◽  
Stopping Power ◽  
Nuclear Stopping ◽  
Resistivity Measurements ◽  
Ion Beam Modification ◽  
Raman Microprobe

AbstractThe electronic and nuclear stopping effects produced by MeV ion bombardment in polyvinylidine chloride (PVDC) and polyethylene (PE) are separated by stacking thin films of the polymers. The resulting multi-layer laminates of each polymer were bombarded with 3.5 MeV alpha particles. The energy of the incident ions was selected, using TRIM, such that the first layers experienced most of the effects of the electronic energy deposited and the last layers received most of the effects of the nuclear stopping power. The changes in the conductance and the chemical structure of each layer were measured by direct resistivity measurements and Raman microprobe analysis.

Study of the effects of MeV Ions on PS and PES

1997 ◽  
Vol 504 ◽  
Author(s):  
A. L. Evelyn ◽  
D. Ila ◽  
R. L. Zimmerman ◽  
K. Bhat ◽  
D. B. Poker ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Microprobe Analysis ◽  
Crosslinking Agent ◽  
Electronic Energy ◽  
Gas Analysis ◽  
Alpha Particles ◽  
Layered System ◽  
Nuclear Stopping ◽  
Raman Microprobe ◽  
Nuclear Effects

ABSTRACTThe electronic and nuclear stopping effects produced by MeV ion bombardment in polyethylene (PE) and polyvinylidene chloride (PVDC) have been previously studied and reported. We have subsequently selected two other insulators: polystyrene (PS) and polyethersulfone (PES) which contains sulfur as a crosslinking agent, and irradiated them with MeV alpha particles. The electronic and nuclear effects of the incident ions were separated by stacking thin films of the polymers. A layered system was selected such that the first layers experienced most of the effects of the electronic energy deposited and the last layers received most of the effects of the nuclear stopping. The changes in the chemical structure were measured by residual gas analysis (RGA), Raman microprobe analysis, RBS and FTIR. The post-irradiation characterization resolved the effects of the stopping powers on the PS and PES and the results were compared with those from PE and PVDC.

Observations of Damage and Transport of Hydrogen in Ion Bombarded Polycrystalline Silicon

1984 ◽  
Vol 33 ◽  
Author(s):  
D. J. Sharp ◽  
J. K. G. Panitz ◽  
C. H. Seager
Keyword(s):  
Polycrystalline Silicon ◽  
Ion Beam ◽  
Columnar Structure ◽  
Hydrogen Transport ◽  
Transport Mechanisms ◽  
Sheet Resistivity ◽  
Near Surface ◽  
Resistivity Measurements ◽  
Transmission Electron ◽  
Defect Passivation

ABSTRACTA combination of chemical etching and sheet resistivity measurements showed that intense (1.4 mA/cm2 ) low energy (1400 eV) ion beam hydrogenation of polycrystalline silicon having a columnar structure can produce electrical defect passivation to depths in the order of 100 μm. Transmission electron micrographs disclose surface and near-surface features resulting from the ion beam bombardment which suggest that one of the hydrogen transport mechanisms may be defect induced.

A review of the alpha radiolysis of extractants for actinide lanthanide separation in spent nuclear fuel reprocessing

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ying Wang ◽  
Yaoshuang Wan ◽  
Yimin Cai ◽  
Lihua Yuan ◽  
Wen Feng ◽  
...  
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Ion Beam ◽  
Radiation Chemistry ◽  
Radiation Stability ◽  
Alpha Particles ◽  
Radiation Sources ◽  
Helium Ion ◽  
Lanthanide Separation ◽  
Alpha Radiolysis

Abstract Radiation stability is one of the key properties to enable the efficient use of extractants in spent nuclear fuel with high radioactivity. The last several decades have witnessed a rapid progress in the radiation chemistry of extractants. A variety of studies and reviews pertinent to the radiation stability of extractants have been published. However, a thorough summary for the alpha radiolysis results of extractants is not available. In this review, we survey the development of alpha radiolysis of extractants for actinide lanthanide separation and compare their radiolysis behaviors induced by alpha particles and gamma rays. The discussion of alpha radiolysis of extractants is divided into three parts according to the functional groups of extractants (i.e., phosphine oxide, amide and bis-triazinyl bipyridines). Given the importance of radiation source to carry out alpha irradiation experiment, we first give a brief introduction to three practicable alpha radiation sources including alpha emitting isotopes, helium ion beam and reactor. We hope this review will provide useful information and unleash a broad palette of opportunities for researchers interested in radiation chemistry.

Terracottas Around Clodion: Chemical and Mineralogical Studies and Thermoluminescence Analysis

1992 ◽  
Vol 267 ◽  
Author(s):  
Frédéric Saltron ◽  
Anne Bouquillon ◽  
Guirec Querré
Keyword(s):  
Microprobe Analysis ◽  
Ion Beam ◽  
The Other ◽  
X Ray ◽  
Thermoluminescence Analysis

ABSTRACTForty one terracottas by Clodion, Marin and P. Michel, all french sculptors of the XVIIIth century, have been analyzed in the L.R.M.F.Two different kinds of analysis have been performed.The results obtained by thermoluminescence allowed to partition the works between one group contemporaneous with the Clodion period and the other one consisting of posterior works. Although the lowest limit in the use of thermoluminescence seems to be reached, the conclusions are, more often than not, in agreement with the hypotheses of the curator.X-Ray diffractometry, microprobe analysis and ion-beam methods (PIXE) have led to distinguish between siliceous pastes corresponding to artifacts created in Paris and carbonated pastes gathering terracottas made during the italian stays of the artists.

Electrical resistivity measurements of heavy ion beam generated high energy density aluminium

2006 ◽  
Vol 39 (17) ◽  
pp. 4743-4747 ◽  
Author(s):  
S Udrea ◽  
N Shilkin ◽  
V E Fortov ◽  
D H H Hoffmann ◽  
J Jacoby ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Energy Density ◽  
Ion Beam ◽  
Heavy Ion ◽  
High Energy ◽  
High Energy Density ◽  
Resistivity Measurements ◽  
Heavy Ion Beam

Adsorption and diffusion of strontium in simulated rock fractures quantified via ion beam analysis

2012 ◽  
Vol 76 (8) ◽  
pp. 3203-3215 ◽  
Author(s):  
T. Ohe ◽  
B. Zou ◽  
K. Noshita ◽  
I. Gomez-Morilla ◽  
C. Jeynes ◽  
...  
Keyword(s):  
Rutherford Backscattering Spectrometry ◽  
Rapid Determination ◽  
Ion Beam ◽  
Effective Diffusion ◽  
Atomic Weight ◽  
Alpha Particles ◽  
Transport Parameters ◽  
Ion Beam Analysis ◽  
Starting Solution ◽  
Beam Analysis

AbstractAn experimental technique has been developed and applied to the problem of determining effective diffusion coefficients and partition coefficients of Sr in low permeability geological materials. This technique, the micro-reactor simulated channel method (MRSC), allows rapid determination of contaminant transport parameters with resulting values comparable to those determined by more traditional methods and also creates product surfaces that are amenable for direct chemical analysis. An attempt to further constrain mass flux was completed by detailed ion beam analysis of polished tuff surfaces (tuff is a polycrystalline polyminerallic aggregate dominated by silicate phases) that had been reacted with Sr solutions at concentrations of 10−5, 10−3 and 10−1 mol l−1. Ion beam analysis was carried out using beams of both protons (using particle induced X-ray emission and elastic backscattering spectrometry or EBS) and alpha-particles (using Rutherford backscattering spectrometry). The ion beam analyses showed that increased solution concentrations resulted in increased surface concentrations and that in the highest concentration experiment, Sr penetrated to at least 4 μm below the primary interface. The Sr surface concentrations determined by EBS were 0.06 (±0.05), 0.87 (±0.30) and 2.40 (±1.0) atomic weight % in the experiments with starting solution concentrations of 10−5, 10−3, and 10−1 mol l−1, respectively.

Electric Field Induced De-channeling in LiNbO3

1993 ◽  
Vol 316 ◽  
Author(s):  
R. L. Zimmerman ◽  
D. Ila ◽  
N. Kukhtarev ◽  
E. K. Williams
Keyword(s):  
Electric Field ◽  
Single Crystals ◽  
Ion Beam ◽  
Crystal Defects ◽  
Alpha Particles ◽  
Fringe Field ◽  
Beam Direction ◽  
Ion Channeling ◽  
Piezoelectric Strain ◽  
Mev Protons

ABSTRACTAn electric field has been imposed on single crystals of pure and doped LiNbO3 during bombardment with 1.03 MeV protons and 2.1 MeV alpha particles. Simultaneous (p,p), (p,α) and (p,p'γ) channeling between the crystal planes showed that the channeling is less pronounced when an electric field of 106 volts/m is imposed perpendicular to the incident ion beam direction and to the channeling planes in the crystal. The results obtained are discussed and compared to the effects due to the fringe field outside the crystal, differential cation-anion movement, movement of interplanar impurities, the piezoelectric strain and movement or creation of crystal defects on ion channeling.

Ion Mixing Kinetics of Thin Layered Films in the Fe-Al System

1983 ◽  
Vol 27 ◽  
Author(s):  
J. Grilhe ◽  
J.P. Riviere ◽  
J. Delafond ◽  
C. Jaouen
Keyword(s):  
Composition Range ◽  
Volume Fraction ◽  
Ion Beam ◽  
Mixed Volume ◽  
Low Doses ◽  
Ion Beam Mixing ◽  
Resistivity Measurements ◽  
Semi Empirical ◽  
Kinetics Of

ABSTRACTEvaporated bilayers and multilayers of Fe and Al have been studied during ion beam mixing with Xe ions using in-situ electrical resistivity measurements. Experiments have been performed in the composition range 40 – 58 at.% Al and at both temperatures 77 K and 300 K. A semi-empirical model is proposed to explain the observed kinetics. At low doses, a square root dependence of the mixed volume fraction on dose is found at 77 K but not at 300 K. The results are discussed by comparison with the different models proposed for ion beam mixing.

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