نتایج جستجو برای: x ray fluorescence xrf
تعداد نتایج: 762676 فیلتر نتایج به سال:
The production of nuclear fuel used in the research reactor at Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN-SP) requires a series of chemical and metallurgical processes. The quality of the end product depends on the control over all the stages of the manufacturing process and over the quality of raw materials employed. In fact, spectrometric methods are increasingly used as quanti...
Context. X-ray flashes (XRFs) are a class of gamma-ray bursts (GRBs) with a peak energy of the time-integrated ν Fν spectrum, Ep, typically below 30 keV, whereas classical GRBs have Ep of a few hundreds of keV. Apart from Ep and the systematically lower luminosity, the properties of XRFs, such as their duration or spectral indices, are typical of the classical GRBs. Yet, the nature of XRFs and ...
Macro X-ray Fluorescence (MA-XRF) scanning is an increasingly widely used technique for analytical imaging of paintings and other artworks. The datasets acquired must be processed to produce maps showing the distribution chemical elements that are present in painting. Existing approaches require varying degrees expert user intervention, particular select a list target against which fit data. In...
Synchrotron radiation based nanoscopic X-ray fluorescence (SR nano-XRF) analysis can visualize trace level elemental distribution in a fully quantitative manner within single cells. However, in-air XRF analysis requires chemical fixation modifying the cell's chemical composition. Here, we describe first nanoscopic XRF analysis upon cryogenically frozen (-150°C) fibroblasts at the ID16A-NI 'Nano...
At present, the use of non-destructive, non-invasive X-ray-based techniques is well established in heritage science for analysis and conservation works art. X-ray fluorescence (XRF) plays a fundamental role since it provides information on elemental composition, contributing to identification materials present superficial layers an artwork. Whenever XRF combined with capability scanning area pr...
The gamma-ray burst (GRB) / X-ray flash (XRF) events GRB031203, discovered by INTEGRAL, and XRF 060218, discovered by Swift, represent two of only five GRB-SNe with optical spectroscopic confirmation of their SN components. Yet their observed high-energy properties offer a sharp contrast: While GRB031203 was detected as a short 40-s burst with a spectrum peaking at Epeak > 190 keV, XRF060218 wa...
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