ISSN:0049-8246    

DOI:10.1002/xrs.1300120302

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

年代:1983

数据来源: WILEY

摘要:

AbstractThe results of investigations into the effect of geometrical surface structure in x‐ray fluorescence analysis of Cu‐Ni alloy are presented. The experimental materials were samples of spectrometric standard quality, in which surfaces were especially prepared by grinding and polishing. The surface state was estimated qualitatively, using a scanning electron microscope, and quantitatively, using a profilograph, by the determination of the roughness parametersRaandRz. The relationships between the roughness parameters and Cu, Ni and Si fluorescent radiation intensities, as well as the scattered radiation from the x‐ray tube anode element were established. The optimum range of the surface state for a given alloy has been de

ISSN:0049-8246    

DOI:10.1002/xrs.1300120303

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

年代:1983

数据来源: WILEY

摘要:

AbstractThe exponential equationR0=R· eR0τdescribes the counting losses in wavelength‐dispersive x‐ray spectroscopic (WDF) detectors up to very high counting rates. The correction error can be considerably lower than 1% for a true counting rate of 7 · 105s−1. The dead time constant τ has however to be determined very accurately for this. Methods of determining τ with the desired accuracy are also described. And finally, a formula for correcting for dead time losses for two detectors in series, where each detector has a different dead time, is deduced and verified by experiment. Here again, one can calculate the true counting rate with an accuracy of 1% at a true counting rate of about

ISSN:0049-8246    

DOI:10.1002/xrs.1300120304

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

年代:1983

数据来源: WILEY

摘要:

AbstractEnergy dispersive x‐ray fluorescence is shown to be an effective analytical method for determination of calcium, sulfur and phosphorous concentrations in wet process phosphoric acid. Periodic monitoring of these quantities is essential to plant operation, and is presently carried out using separate wet chemical analyses. The XRF method described here has the advantages of increased speed, of multi‐element determinations from a single measurement, and of having the potential for on‐line use in an automatic plant control

ISSN:0049-8246    

DOI:10.1002/xrs.1300120305

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

年代:1983

数据来源: WILEY

摘要:

AbstractMost computer XRF‐spectrum deconvolution routines make use of fixed intensity ratios for the lines from one element. The magnitude of the error that fixed ratios imply has been quantitatively evaluated for samples with a varible thickness or matrix. A procedure for routinely adapting the line ratios according to the matrix effect in every sample (by making use of the matrix information present in the scatter peaks) enhances the accuracy of the spectrum evaluatio

ISSN:0049-8246    

DOI:10.1002/xrs.1300120306

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

年代:1983

数据来源: WILEY

摘要:

AbstractEpoxy adhesive and aluminium powder have been used as binders to make permanent standards for x‐ray fluorescence and diffraction. These standards are easy and cheap to fabricate and are very durable. They can be used as internal standards or calibration standards. Three methods of fabrication are proposed and compare

ISSN:0049-8246    

DOI:10.1002/xrs.1300120307

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

年代:1983

数据来源: WILEY

摘要:

AbstractThe analysis of various elements in coal has become important as coal utilization increases. The application of x‐ray fluorescence (XRF) to this type of analysis is complicated by matrix‐correction needs and lack of matrix‐matched standards. The application of fundamental parameter mathematical corrections using easily obtainable doped graphite standards is eval

ISSN:0049-8246    

DOI:10.1002/xrs.1300120308

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

年代:1983

数据来源: WILEY

摘要:

AbstractThe Rasberry‐Heinrich method and its three modifications (delta method, expanded square intensity method and double constant method) together with the Tertian and a strictly empirical method were used for the analysis of copper mattes and slags. The expanded square intensity method, which represents a combination of theory and empiricism, gave the most accurate result

ISSN:0049-8246    

DOI:10.1002/xrs.1300120309

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

年代:1983

数据来源: WILEY

摘要:

AbstractK‐absorption edge‐shifts of copper in CuCl22H2O CuSo45H2O, Cu(NO3)23H2O, Cu(en)3Cl2, Cu(en)3SO4and Cu(en)3(NO3)2in aqueous solutions as well as in polycrystalline form were measured using the x‐ray absorption spectroscopic technique. Effective charge on copper ions are estimated using the method of Gianturco and Coulson. The results of the present study reveal interesting results regarding the nature of chemical bonding. An attempt is made to interpret the results in the light of the available data on th

ISSN:0049-8246    

DOI:10.1002/xrs.1300120310

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

年代:1983

数据来源: WILEY

ISSN:0049-8246    

DOI:10.1002/xrs.1300120312

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

年代:1983

数据来源: WILEY