ISSN:0049-8246    

DOI:10.1002/xrs.1300080102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY

摘要:

AbstractA procedure has been developed for extracting net peak intensities from electron‐beam‐induced energy‐dispersive X‐ray spectra. The procedure has been implemented in a computer program which requires very modest storage capacity of a minicomputer, yet can be executed in a few seconds to yield net intensities. The program structure is simple. Provided the peak to background ratio is better than ∼5 to 1 the intensities are adequate for correction to quantitative analysis with accuracies comparable with more sophisticated and time‐consuming methods. The procedure has been used extensively on a computer‐controlled scanning electron microscope to give rapid information from compli

ISSN:0049-8246    

DOI:10.1002/xrs.1300080103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY

摘要:

AbstractOver recent years, some confusion has arisen regarding the transmission properties of commercially available frame‐mounted polypropylen flow counter windows compared to those of the loose sheet polyethylene teraphthalate (Mylar) material previously available. Experimental results obtained for Ca to F Kα characteristic radiations inclusive enable the transmissions of 6 μm Mylar 1 μm polypropylene to be calculated which in turn are compared to earlier published

ISSN:0049-8246    

DOI:10.1002/xrs.1300080104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY

摘要:

AbstractA loss of sulphur Kα intensity was observed during irradiation of pellets containing some sulphur compounds in organic binders. For elemental sulphur and dibenzyl disulphide mixed with either cellulose or poly(vinyl alcohol), the loss of intensity is attributed to loss of sulphur following reaction with hydrogen produced by radiolysis of the organic binder. No such loss is observed from potassium aluminium sulphate in either binder. The rate of loss of sulphur per unit of energy absorbed by the sample accords with published values for hydrogen production by radiolysis of carbohydrates and alcohols

ISSN:0049-8246    

DOI:10.1002/xrs.1300080105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY

摘要:

AbstractAn X‐ray fluorescence method for the measurement of film and coating thickness has been described for use in situations where standard foils of the same material are not available for comparison. The method is based on the measurement of combined mass absorption coefficient of the coating element at the excitation and at the fluorescent energies using thin samples of a compound in which the coating element is present and then calculating the coating thickness using the fluorescence equation. The paper describes the theoretical approach and presents the result of the measurement of certain film and coating thicknesses which support the theoretical consideration

ISSN:0049-8246    

DOI:10.1002/xrs.1300080106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY

摘要:

AbstractTheoretical grounds for a method of the elimination of absorption matrix effects based upon the application of the measurement of the intensity of the coherent scattered and Compton scattered X‐rays are presented in this paper. The presented method has been confirmed experimentally. The described method of the elimination of the absorption matrix effect can be applied, in the case of samples having ‘intermediate’ masses per unit area, by means of analysis by the X‐ray fluorescence method. The total error (standard deviation) of correction for absorption obtained by the proposed method varies from 3–7% for the values of this correction from 2.5–1.3 respectively. The presented method can be used in the trace analysis of biological and environmenta

ISSN:0049-8246    

DOI:10.1002/xrs.1300080107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY

摘要:

AbstractPentaerythritol is, for a number of given reasons, notable among the relatively limited choice of materials suitable for the manufacture of Bragg X‐ray analysers for use in quantitative X‐ray spectrometry to relatively long wavelengths. In many, perhaps most, Bragg X‐ray optical systems the beam power throughput to the detector, and hence the system sensitivity, is directly proportional to the Bragg reflection integral. Absolute beam power spectrometry thus requires knowledge of the wavelength function of that quantity for the analyser used. In this paper the nature of that function, and its stability, is investigated for diffraction from the (002) planes of pentaeryth

ISSN:0049-8246    

DOI:10.1002/xrs.1300080108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY

摘要:

AbstractA SEM/EDAX/NOVA‐2 system, with quantitative analysis program EDIT/EP7–ZAF auto, has been used for analysing the transition elements in aluminium alloys. Handling the sample carefully and choosing optimum operating conditions, has enabled us to determine the concentrations below 1% of these elements, with a percentage error less than ±10%, in most elements, except in Zn, due to interferences in its Kα line with the

ISSN:0049-8246    

DOI:10.1002/xrs.1300080109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY

摘要:

AbstractA method is described for correcting X‐ray fluorescence spectra for the presence of instrumental interference peaks. The method applies particularly to the analysis of samples which are not infinitely thick. The intensities of coherently and incoherently scattered exciter radiation are used to determine the variable intensity of the interference peak

ISSN:0049-8246    

DOI:10.1002/xrs.1300080110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY

摘要:

AbstractAn off‐line non‐linear least squares fitting procedure is described as part of a program package ‘RUNFIT’. This program supports most of the intensity/correction algorithms currently employed in X‐ray fluorescence spectrometry. The program runs under the Data General DOS operating system and requires a minimum hardware configuration of 32K 16 bit words and two floppy disks. The minimization technique is based on the Marquardt scheme which has the main advantage that the step direction taken in the minimization process always lies in the direction of steepest descent. The RUNFIT program includes various statistical tests on the fitted data which enable the user to make accurate judgements as to the quality of the fitted data. Several examples are given of the use of this approach to typical analytical s

ISSN:0049-8246    

DOI:10.1002/xrs.1300080111

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1979

数据来源: WILEY