Stopping power ≈ Stopping power
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Geant4‐DNA example applications for track structure simulations in liquid water: A report from the Geant4‐DNA Project Open
This Special Report presents a description of Geant4‐DNA user applications dedicated to the simulation of track structures (TS) in liquid water and associated physical quantities (e.g., range, stopping power, mean free path…). These exampl…
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Accurate atomistic first-principles calculations of electronic stopping Open
In this paper, we show that atomistic first-principles calculations based on real-time propagation within time-dependent density functional theory are capable of accurately describing electronic stopping of light projectile atoms in metal …
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Measurement of Charged-Particle Stopping in Warm Dense Plasma Open
We measured the stopping of energetic protons in an isochorically heated solid-density Be plasma with an electron temperature of ∼32 eV, corresponding to moderately coupled [(e^{2}/a)/(k_{B}T_{e}+E_{F})∼0.3] and moderately degenerate [k_{B…
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An Investigation on Radiation Shielding Properties of Borosilicate Glass Systems Open
The aim of this research is to examine the radiation shielding properties of 5B2O3-40SiO2-(55-x)Al2O3-xBaO (BSABa-x) glass systems, which are containing barium and aluminum oxide added to borosilicate glasses, with varying from 25 to 34 we…
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Investigation of photon, neutron and proton shielding features of H3BO3–ZnO–Na2O–BaO glass system Open
The current study aims to explore the shielding properties of multi-component borate-based glass series. Seven glass-samples with composition of (80-y)H3BO3–10ZnO–10Na2O–yBaO where (y = 0, 5, 10, 15, 20, 25 and 30 mol.%) were synthesized b…
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Core Electrons in the Electronic Stopping of Heavy Ions Open
Electronic stopping power in the keV/Å range is accurately calculated from first principles for high atomic-number projectiles and the effect of core states is carefully assessed. The energy loss to electrons in self-irradiated nickel is s…
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Reduction of clinical safety margins in proton therapy enabled by the clinical implementation of dual-energy CT for direct stopping-power prediction Open
A substantial increase in range prediction accuracy in clinical proton treatment planning was achieved by patient-specific DECT-based SPR prediction. For the first time, a relevant imaging-based reduction of range prediction uncertainty on…
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Evaluation of Stopping-Power Prediction by Dual- and Single-Energy Computed Tomography in an Anthropomorphic Ground-Truth Phantom Open
To determine the accuracy of particle range prediction for proton and heavier ion radiation therapy based on dual-energy computed tomography (DECT) in a realistic inhomogeneous geometry and to compare it with the state-of-the-art clinical …
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Electron Elevator: Excitations across the Band Gap via a Dynamical Gap State Open
We use time-dependent density functional theory to study self-irradiated Si. We calculate the electronic stopping power of Si in Si by evaluating the energy transferred to the electrons per unit path length by an ion of kinetic energy from…
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Methylammonium Lead Iodide for Efficient X-ray Energy Conversion Open
We report on photocurrent generation by X-ray irradiation in methylammonium lead iodide CH3NH3PbI3 single crystals. We observed 75% of charge collection efficiency in millimeter sized samples. This efficiency is partially due to the high p…
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Inter-centre variability of CT-based stopping-power prediction in particle therapy: Survey-based evaluation Open
Large inter-centre variability was found in implementation of CT scans, image reconstruction and especially in specification of the CT-to-SPR conversion. A future standardisation would reduce time-intensive institution-specific efforts and…
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Experimental comparison of proton CT and dual energy x-ray CT for relative stopping power estimation in proton therapy Open
Proton computed tomography (pCT) has been proposed as an alternative to x-ray computed tomography (CT) for acquiring relative to water stopping power (RSP) maps used for proton treatment planning dose calculations. In parallel, it has been…
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Measurements of Ion Stopping Around the Bragg Peak in High-Energy-Density Plasmas Open
For the first time, quantitative measurements of ion stopping at energies around the Bragg peak (or peak ion stopping, which occurs at an ion velocity comparable to the average thermal electron velocity), and its dependence on electron tem…
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Experimental validation of two dual‐energy CT methods for proton therapy using heterogeneous tissue samples Open
Purpose The purpose of this work is to evaluate the performance of dual‐energy CT (DECT) for determining proton stopping power ratios (SPRs) in an experimental environment and to demonstrate its potential advantages over conventional singl…
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Examining real-time time-dependent density functional theory nonequilibrium simulations for the calculation of electronic stopping power Open
In ion irradiation processes, electronic stopping power describes the energy transfer rate from the irradiating ion to the target material's electrons. Due to the scarcity and significant uncertainties in experimental electronic stopping p…
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Calibration of the charge and energy loss per unit length of the MicroBooNE liquid argon time projection chamber using muons and protons Open
We describe a method used to calibrate the position- and time-dependent response of the MicroBooNE liquid argon time projection chamber anode wires to ionization particle energy loss. The method makes use of crossing cosmic-ray muons to pa…
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A linear, separable two-parameter model for dual energy CT imaging of proton stopping power computation Open
The proton stopping power estimation accuracy of the proposed linear, separable BVM model is comparable to or better than that of the nonseparable tPFM models proposed by other groups. In contrast to the tPFM, the BVM does not require an i…
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Dosimetric comparison of stopping power calibration with dual‐energy CT and single‐energy CT in proton therapy treatment planning Open
Purpose: The accuracy of proton dose calculation is dependent on the ability to correctly characterize patient tissues with medical imaging. The most common method is to correlate computed tomography (CT) numbers obtained via single‐energy…
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Simulation of Single Particle Displacement Damage in Silicon–Part II: Generation and Long-Time Relaxation of Damage Structure Open
International audience
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Electronic stopping power in a narrow band gap semiconductor from first principles Open
© 2015 American Physical Society. The direction and impact parameter dependence of electronic stopping power, along with its velocity threshold behavior, is investigated in a prototypical small-band-gap semiconductor. We calculate the elec…
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<i>Ab Initio</i> Studies on the Stopping Power of Warm Dense Matter with Time-Dependent Orbital-Free Density Functional Theory Open
Electronic transport properties of warm dense matter, such as electrical or thermal conductivities and nonadiabatic stopping power, are of particular interest to geophysics, planetary science, astrophysics, and inertial confinement fusion …
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Range prediction for tissue mixtures based on dual-energy CT Open
The use of dual-energy CT (DECT) potentially decreases range uncertainties in proton and ion therapy treatment planning via determination of the involved physical target quantities. For eventual clinical application, the correct treatment …
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Gamma, neutron, and heavy charged ion shielding properties of Er<sup>3+</sup>-doped and Sm<sup>3+</sup>-doped zinc borate glasses Open
This study aimed to investigate the nuclear radiation shielding properties of erbium (Er)-reinforced and samarium (Sm)-reinforced borate glasses. In the 0.015–15 MeV photon energy range, attenuation coefficients, as well as half-value laye…
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A simulation study on proton computed tomography (CT) stopping power accuracy using dual energy CT scans as benchmark Open
Background. Accurate stopping power estimation is crucial for treatment planning in proton therapy, and the uncertainties in stopping power are currently the largest contributor to the employed dose margins. Dual energy x-ray computed tomo…
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Multiscale simulations of electron and ion dynamics in self-irradiated silicon Open
The interaction of energetic ions with the electronic and ionic system of target materials is an interesting but challenging multiscale problem, and understanding of the early stages after impact of heavy, initially charged ions is particu…
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Electronic effects in high-energy radiation damage in tungsten Open
Although the effects of the electronic excitations during high-energy radiation damage processes are not currently understood, it is shown that their role in the interaction of radiation with matter is important. We perform molecular dynam…
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Software platform for simulation of a prototype proton <span>CT</span> scanner Open
Purpose Proton computed tomography ( pCT ) is a promising imaging technique to substitute or at least complement x‐ray CT for more accurate proton therapy treatment planning as it allows calculating directly proton relative stopping power …
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The role of pyrimidine and water as underlying molecular constituents for describing radiation damage in living tissue: A comparative study Open
Water is often used as the medium for characterizing the effects of radiation on living tissue. However, in this study, charged-particle track simulations are employed to quantify the induced physicochemical and potential biological implic…
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Electronic stopping power in liquid water for protons and α particles from first principles Open
Atomistic calculations of the electronic stopping power in liquid water for protons and \ensuremath{\alpha} particles from first principles are demonstrated without relying on linear response theory. The computational approach is based on …
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Time-dependent orbital-free density functional theory for electronic stopping power: Comparison to the Mermin-Kohn-Sham theory at high temperatures Open
Electronic stopping power in warm dense matter can affect energy transport and heating in astrophysical processes and internal confinement fusion. For cold condensed matter systems, stopping power can be modeled from first-principles using…