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Friday, July 24, 2020 | History

2 edition of experimental study for electron transmission and bremsstrahlung production found in the catalog.

experimental study for electron transmission and bremsstrahlung production

D. H. Rester

experimental study for electron transmission and bremsstrahlung production

by D. H. Rester

  • 198 Want to read
  • 35 Currently reading

Published by National Aeronautics and Space Administration; for sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va. in [Washington] .
Written in English

    Subjects:
  • Electrons -- Scattering.,
  • Bremsstrahlung.

  • Edition Notes

    Statementby D. H. Rester.
    SeriesNASA contractor report, NASA CR-1383, NASA contractor report ;, NASA CR-1383.
    ContributionsLing-Temco-Vought., George C. Marshall Space Flight Center.
    Classifications
    LC ClassificationsTL521.3.C6 A3 no. 1383
    The Physical Object
    Paginationv, 137 p.
    Number of Pages137
    ID Numbers
    Open LibraryOL4854324M
    LC Control Number75603566

    Radiation Shielding at High-Energy Electron and Proton Accelerators Bremsstrahlung (electron) Pair Production e+ (μ+) Ionization Loss Coulomb Sullivan book. 28 Calculation • Simple cases: estimates of source terms and conservative attenuation lengths, semi-empirical. Fully relativistic treatment of the electron-atom and positron-atom bremsstrahlung is reported. The calculation is based on the partial-wave expansion of the Dirac scattering states in an external atomic field. A comparison of the electron and positron bremsstrahlung is presented for the single and double differential cross sections and the Stokes parameters of the emitted photon. It is Cited by: 5.

    The charged particle data of several satellites must be compared in magnetospheric science and space weather studies. [3] Quantitative particle data imply accurate instrumental responses. However, the responses of energetic electron detectors can be greatly complicated by angular scattering and by bremsstrahlung radiation [Vampola, ]. The Cited by: 9. The maximum energy, Bremsstrahlung energy, Bremsstrahlung number and energy yield of the beta isotopes used in the present study are given in the Table 1. The evaluated Bremsstrahlung spectra employed in the dose calculations are shown in Figures Figures3 3 – 8.

    Bremsstrahlung, rather simplified, is electomagnetic radiation produced by the deceleration of a charged particle when deflected by another charged particle, typically an electron by an atomic nucleus. models must be verified be comparison with benchmark experimental data, such as for electron backscatter and transmission, energy and charge deposition, and x-ray target spectra. Finally we list some topics where further transport model research would be desirable.


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Experimental study for electron transmission and bremsstrahlung production by D. H. Rester Download PDF EPUB FB2

In Part Ill measurements of electron transmission of A1 and Au targets for normal incidence of the electron beam at a bombarding energy of MeV are described. Part IV includes studies of electron trans- mission for a cosine-law source and measurements of electron-brems- strahlung production for non-normal incidence.

experimental study for electron transmission and bremsstrahlung production book Review of absolute doubly differential cross-section experiments and cross-section ratios for electron bremsstrahlung from rare gas atom and thin-film targets. This paper describes the rather accurate Monte Carlo model and cross sections that have been used to calculate effects from electrons and photons on measurement, electronic and biological systems in space.

A number of applications are illustrated, with emphasis on effects from bremsstrahlung Author: Stephen M. Seltzer. This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers. How to Cite This Book ===== The cross section for Bremsstrahlung production can be evaluated theoretically and experimentally [1 - 3] while there are still come disagreements between both.

The bremsstrahlung is softer than the x‐ray beams of corresponding nominal energy since the latter are hardened by the flattening filter. For the 6, 12, and 22 MeV electron beams, the effective attenuation coefficients in water for the bremsstrahlung are, and The depths of maximum dose at cm SSD are, and cm Cited by: Characterization of bremsstrahlung radiations for 6 to 18 MeV electron beam from different Z elements: experimental and simulation approach This chapter deals with the study of bremsstrahlung spectra for 6 to 18 MeV electron beam from different materials such as low to high Z elements as an e -J Size: 1MB.

The current status of experiments on electron bremsstrahlung emission from neutral atoms in thin foils or gases is discussed and a comparison with theory is application of the electron‐photon coincidence technique is beginning to provide a deeper understanding of the elementary radiation process.

Beyond measurements of the triply differential cross section it was possible to Cited by: 1. The efficiency of Bremsstrahlung production in an x-ray tube A. Decreases with both increasing atomic number of the target and increasing electron energy B.

Decreases with increasing atomic number of the target, but increases with increasing electron energy C. Increases with both increasing atomic number of the target and increasing electron energyFile Size: 15KB.

Electron and Bremsstrahlung Penetration and Dose Calculation 7. Author(s) John W. Watts, Jr., and M. Burrell I I 9. Performing Organization Name and Address - ~. George C. Marshall Space Flight Center Marshall Space Flight Center, Alabama Sponsoring Agency Name and Address National Aeronautics and Space AdministrationFile Size: 2MB.

3 Some values in W (Z=74) Energy n Probability 10 keV keV 1 MeV 10 MeV Consequences • Collisional energy primarily converted to heat – At low energies, target cooling essential • Requirements for target – High Z – High melting point – High heat capacity/conductivity • Most targets are made of tungsten embedded in copper.

Abstract. The inverse Bremsstrahlung process is believed to play an important role in the heating of plasma electrons by laser radiation. In this process, an electron absorbs energy from the laser beam during a collision with a nucleus.

From a classical viewpoint, the electron oscillates in the electric Cited by: 2. A similar experimental study has been conducted at CERN with 6–10 GeV electron beams.

The main purpose of this experiment is to study the possibility to use a W single crystal as a positron source at the 8 GeV incident electron by: 7. An L-shell electron (binding energy 26 keV) is removed from an atom that has M-shell binding energy of 4 keV and N-shell binding energy of 1 keV.

If a free electron fills the vacancy in the L-shell, the characteristic x-ray produced will have energy of: a.) 1 keV b.) 4 keV c.) 22 keV d.) 25 keV e.) 26 keV. So, for a positive energy photon to be produced, the electron has to effectively ''lose mass" m e - m" = E # 2/2m" + E &% # % Pair Production Ze ''twisted Bremsstrahlung" Matrix element will be the same; Cross-section will only differ by a kinematic factor Ze + & virtual electron goes ''off mass shell" in electron consider.

Approximately % of the total precipitation energy is converted into bremsstrahlung production for 1 MeV incident electron energy. The number of photoelectrons and Compton electrons produced per precipitating electron is approximately andby: 5. The Bremsstrahlung process An ultra relativistic electron passing near a nucleus is influenced by its strong electric field.

The interaction between electric charges is explained in modern physics by the exchange of photons. In (A), the electron exchanges a photon (not observed) with the nucleus. Modeling the bremsstrahlung of MeV electrons. Source term calculation M. MIREA,2, O. BAJEAT, F.

CLAPIER, M. HASSAINE2,3, F. IBRAHIM, the experimental systematic of bremsstrahlung spectra is not accurate, and the inelastic collision and the bremsstrahlung production. The efficiency of x-ray production is defined as the total x-ray energy expressed as a fraction of the total electrical energy imparted to the anode.

The two factors that determine production efficiency are the voltage applied to the tube, KV, and the atomic number of the anode, Z. The study of the angular distribution of electron bremsstrahlung γ-quanta scattered from the reflector surface through an angle of μrad reveals the emergence of total internal reflection of γ quanta with an energy E γ ≤ by: 2.

with matter, (2) to study photon-electron interactions (3) to study the photoelectric effect with high energy photons interacting with matter, (4) to study the effect of pair production and annihilation involving high energy photons, (5) to study the effects of backscatter and to learn about soft X-ray and Bremsstrahlung production, (6) to learn.

Based on these calculations and additional studies of the analytic and Monte-Carlo representation of Ta-bremsstrahlung spectra [40, 49], as well as on the estimation kT e >2 MeV for the Jena laser gas jet system, a 23(10)% contribution from electrodisintegration was evaluated for the production of Ta in the present work (figure 3).Cited by: The basic components of Monte Carlo simulation of bremsstrahlung emission by electrons are presented.

Various theoretical cross-sections that have been .In the present study a reduction of the x-ray component of electron beams produced by a Clinac C accelerator by a change of the transmission ion chamber and scattering foils is reported.