ISSN:0049-8246    

DOI:10.1002/xrs.1300160402

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

年代:1987

数据来源: WILEY

ISSN:0049-8246    

DOI:10.1002/xrs.1300160403

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

年代:1987

数据来源: WILEY

摘要:

AbstractWavelength‐dispersive X‐RAY SPECTROMETRY can be used to great advantage for the rapid monitoring of the composition of tin‐lead solders. However, account must be taken of some metallurgical properties that influence the X‐ray analysis, viz. the development of concentration gradients during solidification and the process of ageing that sets in at room temperature. Only after these problems have been controlled can a reliable analytical procedure be set up. Standards can be prepared with common facilities and matrix effects are dealt with by simple correction

ISSN:0049-8246    

DOI:10.1002/xrs.1300160404

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

年代:1987

数据来源: WILEY

摘要:

AbstractOil was chosen as a new sampl type for total reflection XRF. A thin‐film sample procedure is described which requires minimal sample preparation. This involves first bringing the oil into solution with a volatile solvent, then pipetting microliter amounts on to the reflector substrate followed by evaporation of the solvent. The linear dynamic range was found to extend to at least 5000 ppm. Detection limit measurements show that minute sample quantities are necessary for optimal detection limits of nanogram amounts. A maximum sample loading is required for the best detection limits in ppm. Using an Mo or Cu X‐ray tube, limits were found to be a few ppm or sub‐nanogram amounts. The spectrometer was calibrated by an internal standardization method and the results of determinations on sample solutions were typically within 10% relative acc

ISSN:0049-8246    

DOI:10.1002/xrs.1300160405

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

年代:1987

数据来源: WILEY

摘要:

AbstractA method for the energy‐dispersive X‐ray fluorescence analysis of Si, S, Fe, Cu, Zn, Pb, Ag, Cd and Sn in massive sulfide samples is described. Samples were prepared as briquettes, and a matrix correction employing inter‐element influence coefficients calculated from fundamental parameters was used. Values calculated in this manner for six international reference materials compare favorably with those found in the literature as well as those determined with other me

ISSN:0049-8246    

DOI:10.1002/xrs.1300160406

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

年代:1987

数据来源: WILEY

摘要:

AbstractFor the determination of the lead, zinc and iron contents of bore‐hole samples from the Rampura‐Agucha lead‐zinc deposit, X‐ray fluorescence spectrometry has been used. The concentration range of the metals, present in the ore body as galena, sphalerite, pyrite and pyrrohotite, is very wide: for Zn 0—30%, for Pb 0—10% and for Fe 1—16%. An internal standard method and a concentration based correction equation have been used to solve the effect of matrix variations, which is the major problem in the development of the programme.Copper added as copper sulphate, which also acts as a good binder, was used as an internal standard for zinc. For Pb Lα1an adjacent Rayleigh diffraction line, Au Lβ1, was used as an internal standard and partially compensates for the matrix effect. The residual correction is made by the use of a mathematical model. For iron, only a mathematical correction is made. There is good agreement between the XRF and wet chemical analysis results for zinc and lead. For iron, the absolute differences are larger, but the correlation coefficient is good for average analy

ISSN:0049-8246    

DOI:10.1002/xrs.1300160407

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

年代:1987

数据来源: WILEY

摘要:

AbstractA measurement of the Lα1,2X‐ray emission spectrum of Zn is described. The experimental 3d band seems to be slightly narrower than the calculated band provided that the lifetime broadening of the 2p level and the instrumental function are taken into account. The high‐energy satellites of the Zn Lα1,2line are discussed and the relative intensities of the features considered. Also, the K emission bands of Zn and Ga have been measured. The quadrupole lines have been identified in these spectra and the relative intensities esti

ISSN:0049-8246    

DOI:10.1002/xrs.1300160408

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

年代:1987

数据来源: WILEY

摘要:

AbstractA simple model is developed to describe the shape and intensity of the low‐energy peak distortion measured with Si(Li) detectors in X‐RAY SPECTROMETRY. Based on this model, a method is outlined for correcting the distortion channel by channel, which drastically reduces the expense of the deconvolution of the pulse‐height spectra measured in energy‐dispersive X‐ray emission analysis with Si(Li)

ISSN:0049-8246    

DOI:10.1002/xrs.1300160409

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

年代:1987

数据来源: WILEY

摘要:

AbstractThe holmium LIIIextended X‐ray absorption was analysed by the Fourier transform method. The effect of regarding the threshold energy as a parameter is discusse

ISSN:0049-8246    

DOI:10.1002/xrs.1300160410

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

年代:1987

数据来源: WILEY

ISSN:0049-8246    

DOI:10.1002/xrs.1300160412

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

年代:1987

数据来源: WILEY