ISSN:0049-8246    

DOI:10.1002/xrs.1300010402

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

年代:1972

数据来源: WILEY

摘要:

AbstractMajor improvement in energy resolution in the last two years have made the Si(Li) X‐ray energy analysis system a significant tool for X‐ray spectroscopy. Its high detection efficiency, coupled with ability to analyse for all element simultaneously, has led to the development of several new techniques for X‐ray analysis. This article reviews the present state of the technology for this instrument with respect to performance characteristics and operating principles. A brief reference to its more important applications is also inc

ISSN:0049-8246    

DOI:10.1002/xrs.1300010403

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

年代:1972

数据来源: WILEY

摘要:

AbstractAn X‐ray spectrometric technique is described which enables nickel, gallium and germanium to be analysed in iron meteorites. It is important to know the concentration of these elements with sufficient accuracy in order to chemically classify iron meteorites. The spectrometer was calibrated against a set of ‘standard’ meteorites with well‐established compositions.To obtain better accuracy, modification to the geometry were made to improve the peak to background ratio and eliminate machine background. This enabled nickel, gallium and germanium to be analysed with accuracies of ±0.05 per cent, ±4 p.p.m. and ±9 p.p.m. respectively for counting periods of 1 min for nickel and 10 min for gallium and germanium at the peak and background

ISSN:0049-8246    

DOI:10.1002/xrs.1300010404

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

年代:1972

数据来源: WILEY

摘要:

AbstractThe characteristic LII,IIIX‐ray emission bands of vanadium in pure metal and nitrides VN0.82and VN are investigated with an electron microprobe. Results are discussed in relation to the theories proposed in the literature. Also presented is the vanadium LIIIabsorption spectrum from the pure metal; this spectrum is processed by the self‐absorption met

ISSN:0049-8246    

DOI:10.1002/xrs.1300010405

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

年代:1972

数据来源: WILEY

摘要:

AbstractIn X‐ray fluorescence analyses, the matrix effects can be evaluated by computing appropriate coefficients. Utilising powder pellets of samples artificially prepared, a method for computing the matrix effects coefficient of H2O, Na2O, MgO, Al2O3, SiO2, K2O, CaO, TiO2, Fe2O3for the analytical lines of thirteen elements: vanadium, chromium, nickel, copper, zinc, gallium, rubidium, strontium, zirconium, barium, lanthanum, cerium and lead is described. The computed coefficients have been used to analyse six international rock standards (the U.S. Geological Survey Standards: G‐2, GSP‐1, AGV‐1, BCR‐1, PCC

ISSN:0049-8246    

DOI:10.1002/xrs.1300010406

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

年代:1972

数据来源: WILEY

摘要:

AbstractSeveral procedures for X‐ray fluorescence analysis of slag including acid solution and fusing methods are compared. For eliminating erros due to inter‐element effects, heavy element addition and calculation methods are considered. Data of precision and accuracy are given for eleven different combinations. For routine operation fusing with borax and casting of a bead is recommended. Fusion in a semi‐automatic bead production machine is time‐saving, simple and more precise than manual operation and is described in some

ISSN:0049-8246    

DOI:10.1002/xrs.1300010407

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

年代:1972

数据来源: WILEY

摘要:

AbstractAn explanation is offered for the appearance of parasitic reflections from LiF (220) analysing crystals. The reflections appear to stem from an unrestricted vertical divergence at the primary collimator allowing entry of reflections from planes other than that to which the crystal is cut. Careful orientation of the crystal boule before cutting would seem to offer the most convenient way of avoiding the problem.

ISSN:0049-8246    

DOI:10.1002/xrs.1300010408

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

年代:1972

数据来源: WILEY

摘要:

AbstractA description is given of the decrease in counting efficiency of a scintillation detector with time. The attenuation of an incident beam for various wavelengths was shown to be consistent with the observation that an amorphous layer had formed on the NaI crystal.

ISSN:0049-8246    

DOI:10.1002/xrs.1300010409

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

年代:1972

数据来源: WILEY

ISSN:0049-8246    

DOI:10.1002/xrs.1300010410

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

年代:1972

数据来源: WILEY

ISSN:0049-8246    

DOI:10.1002/xrs.1300010411

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

年代:1972

数据来源: WILEY