Weak-beam dark-field electron tomography of dislocations in GaN

Electron Beam Dose Distribution in the Presence of Non-Uniform Magnetic Field

Introduction Magnetic fields are capable of altering the trajectory of electron beams andcan be used in radiation therapy.Theaim of this study was to produce regions with dose enhancement and reduction in the medium. Materials and Methods The NdFeB permanent magnets were arranged on the electron applicator in several configurations. Then, after the passage of the electron beams (9 and 15 MeV Va...

Low energy electron beam induced vacancy activation in GaN

Experimental evidence on low energy electron beam induced point defect activation in GaN grown by metal-organic vapor phase epitaxy (MOVPE) is presented. The GaN samples are irradiated with a 5–20 keV electron beam of a scanning electron microscope and investigated by photoluminescence and positron annihilation spectroscopy measurements. The degradation of the band-to-band luminescence of the i...

Artifacts in X-ray Dark-Field Tomography

Grating-based x-ray imaging provides three principle kinds of contrast: absorption, phase, and dark-field. Due to the availability of tomographic reconstruction algorithms for the dark-field contrast, it is now possible to take advantage of quantitative scatter information. However, the published algorithm is based on several assumptions that might be violated in reality. We use numerical simul...

Electron Beam and Optical Depth Profiling of Quasibulk GaN

C-reactive protein and electron beam tomography.

Beam Tomography To the Editor: The study by Park et al1 demonstrates that electron beam tomography (EBT)–derived coronary calcium scores (CCS) are incremental in predicting cardiac risk, consistent with previous data. However, the authors downplay the prognostic power of CCS and elevate the value of C-reactive protein (CRP). They state, “CRP was a marginally significant predictor of MI [myocard...