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A multiplatform code for the analysis of energydispersive Xray fluorescence spectra
 Spectrochim. Acta B 2007
"... Abstract A user friendly program for Xray f luorescence analysis has been developed at the European Synchrotron Radiation Facility. The program allows interactive as well as batch processing of large data sets and it is particularly well suited for Xray imaging. Its implementation of a complete d ..."
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Abstract A user friendly program for Xray f luorescence analysis has been developed at the European Synchrotron Radiation Facility. The program allows interactive as well as batch processing of large data sets and it is particularly well suited for Xray imaging. Its implementation of a complete description of the M shell is particularly helpful for analysis of data collected at low energies. The code is platform independent (Linux, Windows, MacOS X, Solaris …) and it is freely available for noncommercial use. Description of the algorithms used and practical examples are presented.
USE OF THE MONTE CARLO SIMULATION CODE CEARXRF FOR THE EDXRF INVERSE PROBLEM
"... The EDXRF inverse problem is solved by first correcting (if necessary) the sample pulseheight spectrum for pulse pileup with the Monte Carlo code CEARPPU. Then the Monte Carlo Library LeastSquares (MCLLS) approach is used. This approach consists of using a forward Monte Carlo code (CEARXRF) that ..."
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The EDXRF inverse problem is solved by first correcting (if necessary) the sample pulseheight spectrum for pulse pileup with the Monte Carlo code CEARPPU. Then the Monte Carlo Library LeastSquares (MCLLS) approach is used. This approach consists of using a forward Monte Carlo code (CEARXRF) that is capable of simulating the complete nonlinear pulseheight spectral response of any EDXRF system. Using an original estimate of the unknown sample elemental composition, the CEARXRF code is used to simulate the total and individual library spectral responses of all elements. These libraries are then used with the linear Library LeastSquares (LLS) approach to calculate the elemental amounts. Iterations of these steps are made until the estimated and calculated amounts are within prescribed limits so that the measurement nonlinearity is accounted for. The two additional features of Differential Operators and all necessary fundamental parameters have been added to the CEARXRF code and a Graphical User Interface (GUI), respectively, that now allows complete automation of this inverse analysis from qualitative to quantitative. The first of these allows iterations without additional Monte Carlo simulation while the second allows initial qualitative as well as quantitative analysis. Benchmark experimental results are given for a series of aluminum alloy samples for a prototype system that employs the radioisotope source 109 Cd and a Si(Li) detector. These results indicate that the approach is accurate and should be very useful to the EDXRF analyst.
Copyright ©JCPDS International Centre for Diffraction Data 2005, Advances in Xray Analysis, Volume 48. 253 DEVELOPMENT OF A MONTE CARLO – LIBRARY LEAST SQUARES (MCLLS) CODE PACKAGE FOR THE EDXRF INVERSE PROBLEM ABSTRACT
"... The Monte Carlo – Library LeastSquares (MCLLS) approach has now been developed, implemented, and tested for solving the inverse problem of EDXRF sample analysis. It consists of a linear library leastsquares (LLS) code and a comprehensive Monte Carlo code named CEARXRF that is capable of calculatin ..."
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The Monte Carlo – Library LeastSquares (MCLLS) approach has now been developed, implemented, and tested for solving the inverse problem of EDXRF sample analysis. It consists of a linear library leastsquares (LLS) code and a comprehensive Monte Carlo code named CEARXRF that is capable of calculating the unknown sample spectrum, all the elemental library spectra in the sample, and the differential operators for each library spectrum with respect to each element. Two codes with Graphical User Interface (GUI) have been designed to implement the MCLLS approach and benchmark results are presented for the two stainless steel samples; SS304 and SS316. The results are accurate, the system is easy to use, and all indications are that this approach will be very useful for the EDXRF practitioner.
Beam Backgrounds at CLEO: Design and Performance of the CESR High Luminosity Interaction Region
"... In November 1995, the Cornell Electron Storage Ring (CESR) began Phase II operations. The CESR/CLEO Phase II upgrade involved the installation of a silicon vertex detector for the CLEO experiment and an interaction region optimized for a smallradius beampipe and bunchtrain collisions at total beam ..."
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In November 1995, the Cornell Electron Storage Ring (CESR) began Phase II operations. The CESR/CLEO Phase II upgrade involved the installation of a silicon vertex detector for the CLEO experiment and an interaction region optimized for a smallradius beampipe and bunchtrain collisions at total beam currents of 600 mA. The design of the CESR Phase II Interaction Region is described and the operational experience of the IR is summarized. Measurements of beamgenerated detector backgrounds are compared with predictions from detector background simulations. 1 Introduction The Cornell Electron Storage Ring (CESR) began Phase II Operation in November 1995 following the installation of the Phase II Interaction Region (IR) [1]. The Phase II IR was optimized for bunchtrain collisions at a finite crossing angle to provide a design luminosity of 6 \Theta 10 32 cm \Gamma2 sec \Gamma1 . As part of the upgrade project, the CLEO Experiment installed a silicon vertex detector (SVX) around a s...
Atomic cluster calculation of the Xray nearedge absorption of copper
, 2005
"... The finite difference method for nearedge structure is used to calculate Xray absorption nearedge structure (XANES) spectra. We extend the range of calculation for copper above the Kshell threshold and compare the results with recent experimental data in the Xray absorption fine structure (XAFS ..."
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The finite difference method for nearedge structure is used to calculate Xray absorption nearedge structure (XANES) spectra. We extend the range of calculation for copper above the Kshell threshold and compare the results with recent experimental data in the Xray absorption fine structure (XAFS) region. Qualitatively the calculation predicts the location of the peaks but fails to accurately describe relative amplitudes.
Measurements of K shell production crosssection and fluorescence yield for Y element
, 2015
"... Abstract: K shell X ray production crosssection have been measured for Y element. Measurements have been carried out at 16.896 keV excitation energy using secondary source. K Xrays emitted by samples have been counted by a Si(Li) detector with 160 eV resolution at 5.9 keV. The values of K shell ..."
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Abstract: K shell X ray production crosssection have been measured for Y element. Measurements have been carried out at 16.896 keV excitation energy using secondary source. K Xrays emitted by samples have been counted by a Si(Li) detector with 160 eV resolution at 5.9 keV. The values of K shell fluorescence yield has been evaluated for Y element. The results obtained for fluorescence yield and K X ray production crosssection has been compared with the theoretically calculated values and other available semiempirical fits values.