نتایج جستجو برای: bremsstrahlung

تعداد نتایج: 2286  

2008
S. A. YOST B. F. L. WARD

We discuss techniques for obtaining a numerically stable evaluation of the fully differential cross section for the virtual photon correction to single hard photon bremsstrahlung in two different computational schemes. We also compare the role of finite mass corrections in these schemes.

جوهری دها, فریبا, افتخاری, محمد, رجبی, حسین, طالشی آهنگری, هادی,

Background and purpose: Imaging which is used in nuclear medicine is done using emit gamma rays whereas therapy in nuclear medicine is performed by applying radionuclide’s which emit beta radiation. Using Bremsstrahlung is a new field which is recently introduced in imaging. In the Bremsstrahlung imaging, collimator design should not be based on energy peak and whole energy spectrum should be c...

2016
Tajinder Singh

Bremsstrahlung spectral photon distributions produced by continuous beta particles of beta emitter 147Pm and 45Ca in thick targets studied in a photon energy region 10-30 keV. The bremsstrahlung spectral photon distribution measured with X-PIPS Si (Li) detector. The experimental results were compared with the theoretical bremsstrahlung distribution obtained from ordinary bremsstrahlung (OB) the...

Introduction: In clinical electron beams, most of bremsstrahlung radiation is produced by various linac head structures. This bremsstrahlung radiation dose is influenced by the geometry and construction of every component of the linac treatment head structures. Thus, it can be expected that the amount of the contaminated photon dose due to bremsstrahlung radiation varies among different linacs,...

1999
Matthew G. Baring Frank C. Jones Donald C. Ellison

There has recently been interest in the role of inverse bremsstrahlung, the emission of photons by fast suprathermal ions in collisions with ambient electrons possessing relatively low velocities, in tenuous plasmas in various astrophysical contexts. This follows a long hiatus in the application of suprathermal ion bremsstrahlung to astrophysical models since the early 1970s. The potential impo...

2010
R. Märtin R. Barday J. Enders M. Hegewald

Bremsstrahlung is one of the basic photon-matter processes occurring in collisions of electrons with atoms and ions. Bremsstrahlung in electron-atom collisions has been the object of extensive experimental and theoretical studies [1]. These studies focused on the angular dependence of the intensity distribution of the bremsstrahlung, as well as on its linear polarization [2]. Another production...

Journal: :Physical Review A 1972

Journal: :iranian journal of radiation research 0
m.r. teimoori sichani department of medical radiation engineering, science and research branch, islamic azad university, tehran, iran m. amoui department of nuclear medicine, shahid beheshti university of medical science, tehran, iran sh. akhlaghpoor noor medical imaging center, tehran, iran m. hosntalab department of medical radiation engineering, science and research branch, islamic azad university, tehran, iran

background: in this study, quantitative 32p bremsstrahlung planar and spect imaging and consequent dose assessment were carried out as a comprehensive phantom study to define an appropriate method for accurate dosimetry in clinical practice. materials and methods: ct, planar and spect bremsstrahlung images of jaszczak phantom containing a known activity of 32p were acquired. in addition, phanto...

Journal: :Physical Review C 1999

M. Amoui, M. Hosntalab, M.R. Teimoori Sichani, Sh. Akhlaghpoor,

Background: In this study, Quantitative 32P bremsstrahlung planar and SPECT imaging and consequent dose assessment were carried out as a comprehensive phantom study to define an appropriate method for accurate Dosimetry in clinical practice. Materials and Methods: CT, planar and SPECT bremsstrahlung images of Jaszczak phantom containing a known activity of 32P were acquired. In addition, Phanto...

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