نتایج جستجو برای: روش xrf
تعداد نتایج: 372314 فیلتر نتایج به سال:
Confocal X-ray fluorescence (XRF) spectrometry can be used to perform three-dimensional elemental analysis, which is impossible using general micro XRF without any collimating optics in the detection channel. In this study, we designed, for first time, a new confocal line (C-L-XRF) system that obtain information of larger area and higher intensity analysis than conventional point (C-P-XRF) anal...
RECENT DEVELOPMENTS IN HANDHELD X-RAY FLUORESENCE INSTRUMENTATION The introduction of new large area silicon drift detectors to handheld XRF technology expands technique capabilities with greater analytical range and lower detection limits James Pasmore, Director, Business Development [email protected] Thermo Niton Analyzers LLC Thermo Fisher Scientific 900 Middlesex Turnpike, Buil...
Nano-MgO was successfully deposited on titania using deposition-precipitation method. The catalyst produced was characterised using FTIR, XRD, BET and XRF and its activity was tested on the transesterification reaction of soybean oil to biodiesel. The catalyst activity improved when the reaction temperature was increasedfrom 150 and 225 C. It was also observed that increasing the reaction time ...
ابسیدین شیشه¬سنگی آتشفشانی است که در اثر فوران گدازه¬های آتشفشانی و سرد شدن سریع آنها در سطح زمین به وجود می¬آید. به¬علت خصوصیات منحصر¬به¬فردی همچون تیزی و ظرافت فوق¬العاده مردمان پیش¬از¬تاریخ از این سنگ به¬عنوان ابزار، سلاح و زیور¬آلات استفاده می¬کردند توسعه و رشد ابسیدین، آخرین مرحله استفاده موثر بشر از ابزارهای سنگی می باشد. در ایران دست¬افزارهای ابسیدینی از مناطق وسیعی شامل شمال¬غرب، زاگر...
Introduction: The Stardust mission to comet Wild 2 has provided numerous extraterrestrial particles and resulting 'tracks' of finer particles in melted silica aerogel [1]. We have utilized a combination of Laser Confocal Scanning Microscopy (LCSM) and Synchrotron X-Ray Fluorescence (XRF) to characterize a variety of whole tracks both morphologically and chemically, all in 3-dimensions [2]. The ...
A new method to measure the trace elemental composition of size-resolved airborne particles that uses acetone extraction followed by ICPMS analysis is compared to three other established methods: copper anode XRF, molybdenum anode XRF, and an ICPMS method that uses HF digestion. The method detection limit (MDL), accuracy, and precision of each method is studied through the analysis of ambient s...
Tributyltin (TBT) and other organotin compounds have been restricted for use on leisure boats since 1989 in the EU. Nonetheless, release of TBT is observed from leisure boats during hull maintenance work, such as pressure hosing. In this work, we used a handheld X-ray Fluorescence analyser (XRF) calibrated for antifouling paint matrixes to measure tin, copper and zinc in antifouling paints coat...
The development of a rapid and non-destructive method to assess purity levels in samples of biogenic silica prior to geochemical/isotope analysis remains a key objective in improving both the quality and use of such data in environmental and palaeoclimatic research. Here a Fourier Transform Infrared Spectroscopy (FTIR) mass-balance method is demonstrated for calculating levels of contamination ...
OBJECTIVES X-ray fluorescence (XRF) is a non-invasive method for determining the iodine content of the thyroid gland in vivo. In spite of the obvious clinical value of such a method in situations of iodine deficiency or iodine overload, the method has not so far been widely used. The objective was to investigate the applicability of the XRF method in a larger number of subjects. DESIGN AND SU...
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 ...
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