Monte Carlo simulations of electron-beam/solid interactions as an aid in interpretation of EDS and auger analysis of particles and defects

Monte Carlo simulations were used to study photon production in a panoramic X-ray tube with a conical tungsten target to determine the optimal characteristics of the target shape and electron beam configuration. Several simulations were performed for accelerating potentials equal to 250 kV, 300 kV, and 500 kV with electron beams of various radii and anode sizes. The angular distribution of the photon intensity was analysed by numerical calculations for an assembly composed of an X-ray tube and an external collimator with a cylindrical hole to simulate a panoramic scanning system with an X-ray pencil beam.

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Qualitative analysis of irregular fields delivered with dual electron multileaf collimator: A Monte Carlo study

Polish Journal of Medical Physics and Engineering ◽

10.1515/pjmpe-2016-0002 ◽

2016 ◽

Vol 22 (1) ◽

pp. 5-9

Author(s):

Samuel Okon Inyang ◽

Alan Chamberlain

Keyword(s):

Monte Carlo ◽

Electron Beam ◽

Qualitative Analysis ◽

Monte Carlo Simulations ◽

Electron Beams ◽

Monte Carlo Study ◽

Multileaf Collimator ◽

Water Phantom ◽

Electron Beam Therapy

Abstract The use of a dual electron multileaf collimator (eMLC) to collimate therapeutic electron beam without the use of cutouts has been previously shown to be feasible. Further Monte Carlo simulations were performed in this study to verify the nature and appearance of the isodose distribution in water phantom of irregular electron beams delivered by the eMLC. Electron fields used in this study were selected to reflect those used in electron beam therapy. Results of this study show that the isodose distribution in a water phantom obtained from the simulation of irregular electron beams through the eMLC conforms to the pattern of the eMLC used in the delivery of the beam. It is therefore concluded that the dual eMLC could deliver isodose distributions reflecting the pattern of the eMLC field that was used in the delivery of the beam.

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Study of the Peak to Background (P/B) Method Behavior as a Function of Take-Off Angle, Tilt Angle, Particle Size, and Beam Energy

Scanning ◽

10.1155/2021/8070721 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Seyed Mahmoud Bayazid ◽

Yu Yuan ◽

Raynald Gauvin

Keyword(s):

Particle Size ◽

Monte Carlo ◽

Electron Beam ◽

Monte Carlo Simulations ◽

Tilt Angle ◽

Beam Energy ◽

Spherical Particles ◽

Beam Position ◽

Size Of Particles ◽

Higher Sensitivity

Monte Carlo simulations were performed to investigate the behavior of the peak to background ratio (P/B) of particles on a substrate as a function of different variables such as take-off angle, tilt angle, particle size, and beam energy. The results showed that the P/B highly depends on the beam energy, the size of particles, and the composition of the substrates. Results showed that the rate of intensity reduction of the peak is less than the background for a high tilt angle (60 degrees), and thereby, the P/B increases at a high tilt angle. It was shown that by increasing the take-off angle, the P/B initially reduces and then reaches a plateau. Results showed that the P/B highly depends on the size of particles. Analyses showed that by moving the electron beam from the center to the side of the particle, the P/B increases. Finally, the spherical particles have higher sensitivity of the P/B to the beam position than the cubical particles.

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