Peculiarities of the spatial behaviour of the dislocation lines resulting from scattering of coherent radiation from random and fractal rough surfaces are studied. The technique of optical correlation is proposed for diagnostics of phase singularities in a complex speckle field by comparing the correlation lengths of amplitude and intensity of the local fields. It is shown that the dislocation ...

dN The field scattered by an antenna contains a component that is the short circuit scattered field normalized by the short circuit current, and a second component that ls the radiation field normalized by the transmitting current and multiplied by a factor (1 r). RCS is the magnitude squared of the difference between two terms, one being the square root of a complex "structural" cross section,...

A new efficient scheme for imaging gamma-ray emitting objects is advocated in this work. A few years back we have put forward the idea of collecting data on Compton scattered rays to reconstruct an object in three dimensions and shown how it works with a collimated detector. To increase drastically the sensitivity of this modality as well as its field of view and resolution we propose now that ...

Cone-beam computed tomography (CBCT) images have inaccurate CT numbers because of scattered photons. Thus, quantitative analysis of scattered photons that affect an electron density (ED) curve and calculated doses may be effective information to achieve CBCT-based radiation treatment planning. We quantitatively evaluated the effect of scattered photons on the accuracy of dose calculations from ...

In support of an experiment designed tomeasure the strength of radiation scattered from low-density free electrons in an intense laser focus, we model a variety of physical parameters that impact the rate of scattered photons. We employ a classical model to characterize duration of electron exposure to high-intensity laser light in a situation where the electrons are driven by strong ponderomot...

BACKGROUND We investigated the health effects of low-dose radiation on cardiologists exposed to scattered radiation while performing cardiac catheterization (CC) in a hospital setting from 2003 to 2006. METHODS We performed a 4-year retrospective study on 2, 292 medical doctors, using claims data from all contracted hospitals of the Bureau of National Health Insurance, Taiwan. We gathered sta...

When a brass compensator is set in a treatment beam, beam hardening may take place. This variation of the energy spectrum may affect the accuracy of dose calculation by a treatment planning system and the results of dose measurement of brass compensator intensity modulated radiation therapy (IMRT). In addition, when X-rays pass the compensator, scattered photons are generated within the compens...

We study linear polarization due to scattering of light on a cloudlet of particles, taking into account the radiation drag and the gravitational pull exerted on them by a central body. Effects of special and general relativity are included by connecting a model of Beloborodov (1998) for the local polarization of scattered light with Abramowicz, Ellis & Lanza (1990) formalism for the particle mo...

Sir Chandrasekhara Venkata Raman was justifiably excited when he noticed that when a monochromatic light beam is passed through a simple transparent liquid, different colors can be detected in the scattered light. Raman called this frequency-shifted scattered light ‘a new type of secondary radiation’, because he realized that the phenomenon he discovered was caused by a molecular property diffe...

The newly introduced coherence-based technique of X-ray near-field speckle (XNFS) has been implemented at 8-ID-I at the Advanced Photon Source. In the near-field regime of high-brilliance synchrotron X-rays scattered from a sample of interest, it turns out that, when the scattered radiation and the main beam both impinge upon an X-ray area detector, the measured intensity shows low-contrast spe...