This thesis uses early-time and simultaneous data from all three instruments on-board Swift to explore how the conditions of long Gamma-Ray Bursts (GRBs) and their envi­ ronment affect their observed prompt and afterglow properties. I firstly analyse two long GRBs with properties that distinguish them from the more standard class of long GRB; XRF 050406 and GRB 061007. The X-Ray Flash XRF 05040...

In this paper we will introduce the general benefits of X-Ray Fluorescence spectrometry (XRF) for assessing the condition of the outer environment, especially where ambient aerosol particles are causing environmental disturbances. Examples from recent environmental studies are presented, and energy dispersive XRF is concluded to be a powerful, nondestructive yet easily applicable tool to supply...

Poly-lactide-co-glycolide (PLGA) is one of the few polymers approved by the US Food and Drug Administration as a carrier for drug administration in humans; therefore, it is one of the most used materials in the formulation of polymeric nanoparticles (NPs) for therapeutic purposes. Because the cellular uptake of polymeric NPs is a hot topic in the nanomedicine field, the development of technique...

AMPTEK INC. 14 DeAngelo Drive, Bedford, MA 01730-2204 U.S.A. APPLICATIONS • X-Ray Fluorescence • Thin-film Analysis • RoHS/WEEE Analysis • Teaching and Research • Art and Archaeology • Process Control • X-ray Tube Characterization FEATURES • Fundamental parameters (FP) • Analysis with or without standards • General bulk and thin-film analysis • Analyze up to 40 elements • Supports all Amptek de...

in this work x-ray fluorescence (xrf) technique was used to evaluate the soil pollution withheavy metals for twenty four surface soil samples (0–10 cm in depth) from various locations to cover theindustrial area in omdurman city, sudan. concentrations of 10 elements cr, ni, cu, zn, zr, pb, rb, co, cd andas were determined. it was found that cr, cu and cd concentrations for almost all studied si...

This work describes a tabletop (50 cm × 25 cm × 25 cm) full field X-ray pinhole camera (FF-XPC) presenting high energy- and high spatial-resolution. The FF-XPC consists of a conventional charge-coupled device (CCD) detector coupled, in a coaxial geometry, to a pinhole collimator of small diameter. The X-ray fluorescence (XRF) is induced on the samples with an external low-power X-ray tube. The ...

We present Swift-UVOT data on the optical afterglow of the X-ray flash of 2005 April 6 (XRF 050406) from 88 s to ∼ 10 5 s after the initial prompt γ-ray emission. Our observations in the V, B and U bands are the earliest that have been taken of an XRF optical counterpart. Combining the early-time optical temporal and spectral properties with γ-and simultaneous X-ray data taken with the BAT and ...

Grazing Incidence X-Ray Fluorescence (GI-XRF) technique is a powerful tool for the characterization of depth profile concentrations in multilayered samples. A modeling program called ANDEN has been developed for simulating GI-XRF data for layered thin films [1]. ANDEN was used as one of the tools to study the dependence of dopants distribution with magnetic behavior in Diluted Magnetic Semicond...

Introduction Archaeochemists are called on to analyze a wide variety of samples, ranging from metals, pigments, and glasses to bones, stones, and soils. In most cases these samples are solids. Although non-destructive and/or micro-sample analyses are preferable for these cultural resources, in many cases there is a large amount of material available for analysis. In those instances where non-de...