Stopping powers and inelastic mean free path of 200 eV–50 keV electrons in polymer PMMA, PE, and PVC

Tahir, Dahlang; Suarga, Suarga; Sari, Nur Harmila; Yulianti,

doi:10.1016/j.apradiso.2014.10.001

Cited by 35 publications

(16 citation statements)

References 21 publications

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“…The method of calculation SP and IMFP in this study was described in detail in our previous paper, briefly repeated here. The first step is the calculation of the ELF that was extensively tested for the validity and the consistency applied in various materials, metal, for ultrathin dielectrics, semiconductor, polymer, and transparent oxide films …”

Section: Calculation Methodsmentioning

confidence: 99%

“…The dependence of ω 0ik on k is generally unknown, but we use Equation with α i as an adjustable parameter. The values of the momentum dispersion coefficient α i are related to the effective mass, eg, α I ≈ 0 for insulator and α i ≈ 1 for metals . The step function θ ( ħω − E g ) is included to describe the effect of the band gap energy E g in semiconductors and insulators.…”

Section: Calculation Methodsmentioning

confidence: 99%

“…In REELS, the physical processes taking place when incident electron moves in a solid surface involve the complex interactions with outer or inner shell atomic electrons in the solid . During the traveling in the solid, some of the energy electrons loss as a function of the distance along the trajectory in the solids defined as a stopping power (SP) . SP and inelastic mean free path (IMFP) are important parameters for surface electron spectroscopy analysis, research in the field of biomedical applications, and modeling of electron transport in electron‐probe microanalysis, Auger spectroscopy, and dimensional metrology in scanning electron microscope …”

Section: Introductionmentioning

confidence: 99%

“…In this study, we have used the ELF from the quantitative analysis of experimental REELS in determining SPs and IMFPs of Fe, Ni, Pd, and Ti for electron energies from 150 eV to 10 keV. The ELF in this study was taken from previous publications for Ni from Tahir et al and Fe, Pd, and Ti from Tahir et al The SPs were compared with several method of calculations; Bethe in Tahir et al and Tanuma et al, Nguyen‐Truong, Joy and Luo, and Jablonski et al and the IMFP compared with Tanuma Powell Penn (TPP2M) methods, which can be freely downloaded from http://www.quases.com/products/quases-imfp-tpp2m/, from the previous studies, and also NIST from http://www.nist.gov/index.html . The purpose of this work is to provide alternative basic data from the experimental determination of SP and IMFP for the study electrons transport through Ti, Fe, Ni, and Pd.…”

Section: Introductionmentioning

confidence: 99%

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Stopping powers and inelastic mean free path from quantitative analysis of experimental REELS spectra for electrons in Ti, Fe, Ni, and Pd

Suryani

Heryanto

Tahir

2019

Surface & Interface Analysis

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Stopping power (SP) and inelastic mean free path (IMFP) of electrons in Ti, Fe, Ni, and Pd have been determined by using dielectric models. We have used energy loss function (ELF) determined from quantitative analysis of experimental reflection electron energy loss spectroscopy (REELS) spectra as the input parameter for this model. ELF in this study was determined from the previously published quantitative analysis of REELS spectra. The SP of Fe, Ni, Pd, and Ti was compared with several calculation methods for energies from 100 eV to 10 keV and shows SP in this study, which are in best agreement for medium to high energies (greater than or equal to 300 eV). The IMFP obtained in this study shows the best agreement with online database TPP2M and NIST and also calculation by Tanuma with a root mean square (rms) less than 12%. The present approach shows ELF from quantitative analysis of REELS spectra has a high potential for the experimental determination of SP and IMFP of metals.

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Section: Calculation Methodsmentioning

confidence: 99%

Section: Calculation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stopping powers and inelastic mean free path from quantitative analysis of experimental REELS spectra for electrons in Ti, Fe, Ni, and Pd

Suryani

Heryanto

Tahir

2019

Surface & Interface Analysis

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“…It includes four regions-of-interest (ROIs) used for evaluating the absorbed dose. Simulations were performed using 541 mm source-to-iso distance, a fan angle of 52°, a longitudinal beam collimation of 40 mm corresponding to 64 slices, 10 9 incident x-ray photons per monochromatic scan and 1.2 9 10 10 per polychromatic scan, and each scan consists of 984 views.…”

Section: J Simulation Studiesmentioning

confidence: 99%

Model‐based dose reconstruction for CT dose estimation

Yin

Man

2017

Medical Physics

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Purpose: Our goal is to develop a model-based approach for CT dose estimation. We previously presented a CT dose estimation method that offered good accuracy in soft tissue regions but lower accuracy in bone regions. In this work, we propose an improved physic-based approach to achieve high accuracy for any materials and realistic clinical anatomies. Methods: Like Monte Carlo techniques, we start from a model or image of the patient and we model all relevant x-ray interaction processes. Unlike Monte Carlo techniques, we do not track each individual photon, but we compute the average behavior of the x-ray interactions, combining pencil-beam calculations for the first-order interactions and kernels for the higher order interactions. The new algorithm more accurately models the variation of materials in the human body, especially for higher attenuation materials such as bone, as well as the various x-ray attenuation processes. We performed validation experiments with analytic phantoms and a polychromatic x-ray spectrum, comparing to Monte Carlo simulation (GEANT4) as the ground truth. Results: The results show that the proposed method has improved accuracy in both soft tissue region and bone region: less than 6% voxel-wise errors and less than 3.2% ROI-based errors in an anthropomorphic phantom. The computational cost is on the order of a low-resolution filtered backprojection reconstruction. Conclusions: We introduced improved physics-based models in a fast CT dose reconstruction approach. The improved approach demonstrated quantitatively good correspondence to a Monte Carlo gold standard in both soft tissue and bone regions in a chest phantom with a realistic polychromatic spectrum and could potentially be used for real-time applications such as patient-and organ-specific scan planning and organ dose reporting.

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Synthesis Methods of Fe₃O₄ Nanoparticles for Biomedical Applications

et al. 2023

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Magnetic nanoparticles made from organic and inorganic materials have gained significant technological progress and are widely applied in biomedicine, including magnetic resonance imaging, targeted drug delivery systems, biosensors, hyperthermia, and tissue engineering. The most reported synthesis methods include hydrothermal, sol‐gel, laser ablation, microemulsion, and ball‐milling methods. The synthesis parameters have a strong correlation with essential properties, such as phase, size, and surface morphology, which greatly influence the macroscopic properties and potential applications of the particles. Different preparation methods result in magnetic nanoparticles with varying characteristics, and the appropriate method can be chosen based on the requirements of the specific application. Two effective methods for synthesizing magnetic nanoparticles are coprecipitation and hydrothermal method because the preparation is relatively simple with low energy consumption, and uniform and homogeneous crystals are obtained.

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Stopping powers and inelastic mean free path of 200 eV–50 keV electrons in polymer PMMA, PE, and PVC

Cited by 35 publications

References 21 publications

Stopping powers and inelastic mean free path from quantitative analysis of experimental REELS spectra for electrons in Ti, Fe, Ni, and Pd

Stopping powers and inelastic mean free path from quantitative analysis of experimental REELS spectra for electrons in Ti, Fe, Ni, and Pd

Model‐based dose reconstruction for CT dose estimation

Synthesis Methods of Fe₃O₄ Nanoparticles for Biomedical Applications

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Stopping powers and inelastic mean free path of 200 eV–50 keV electrons in polymer PMMA, PE, and PVC

Cited by 35 publications

References 21 publications

Stopping powers and inelastic mean free path from quantitative analysis of experimental REELS spectra for electrons in Ti, Fe, Ni, and Pd

Stopping powers and inelastic mean free path from quantitative analysis of experimental REELS spectra for electrons in Ti, Fe, Ni, and Pd

Model‐based dose reconstruction for CT dose estimation

Synthesis Methods of Fe3O4 Nanoparticles for Biomedical Applications

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Synthesis Methods of Fe₃O₄ Nanoparticles for Biomedical Applications