ISSN:0049-8246    

DOI:10.1002/xrs.1300030211

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

年代:1974

数据来源: WILEY

ISSN:0049-8246    

DOI:10.1002/xrs.1300030214

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

年代:1974

数据来源: WILEY

ISSN:0049-8246    

DOI:10.1002/xrs.1300030215

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

年代:1974

数据来源: WILEY

ISSN:0049-8246    

DOI:10.1002/xrs.1300030202

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

年代:1974

数据来源: WILEY

摘要:

AbstractFour independent techniques for quantitatively calibrating an energy dispersive X‐ray fluorescence system are compared. These include commercially available powder standards, vacuum deposited standards, laboratory developed powder standards and a semi‐theoretical method. A technique is presented for using the latter method in the case where the exciting radiation is bremsstrahlung. These methods are discussed and their resulting efficiency values compared. The most complete, most reliable and easiest method is the semi‐theoretical method. Single compound powders of standard chemicals can be used one at a time for periodic checks of the s

ISSN:0049-8246    

DOI:10.1002/xrs.1300030203

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

年代:1974

数据来源: WILEY

摘要:

AbstractLe volume de liquide extracellualaire (LEC) chez l'homme estun parameétre important pour la deétection de certins eétats pathologiques. La spectromeétrie de fluorescence X permet de mesurer avec une bonne preécision I'espace de deffusion de I'ion bromure et d'en deédrire la valeur du volume de LEC. La meéthode consiste en un dosage direct du brome stabel (80Br) à faible concentration dans les liquides biologiques, en utilisant la raie Br Kα Une étude paralleéle au moyen d'un radiotraceur (82Br)permet de tester la valcur de l

ISSN:0049-8246    

DOI:10.1002/xrs.1300030204

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

年代:1974

数据来源: WILEY

摘要:

AbstractTheoretical to formulae for the fluoresent X‐ray intenisty are obtained and calculations made for nickel + iron + chromium binary and tertiary systems. In the calculation, the continous X‐ray of the irradiating source should be taken into account. The theoretical results agree well with the experimental results but have maximum deviations of 1% and it is thought that the error may be due to coexistent elements. The effect of the coexistent elements can be estimated by theoretical calculation and in routine work the effects are usually expressed as linear expansion factors. These factors are generally obtained from a series of experiments but they can be easily obtained by calculation. The errors caused by the linear approximation are also estimated and it is concluded that the approximation is approved in routine analysis of steels when the composition ranges of the steel type are limited by industrial standa

ISSN:0049-8246    

DOI:10.1002/xrs.1300030205

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

年代:1974

数据来源: WILEY

摘要:

AbstractThe amount of material usually required for X‐ray fluorescene analysis of briquetted rock powders is of the order of 2 to 3 g. By reducing the diameter of the pellets and the cross‐section of the incident X‐ray beam, it is possible to analyse a small quantity of material (about 40 mg) reliably. The results obtained from the analysis of about 40 mg of powder for the major components (MgO, Al2O33, SiO2, P2O5, K2O, CaO, TiO2, MnO, Fe2O3) and for 12 trace elements (Cr, Ni, Cu, Zn, Ga, Rb, Sr, Zr, La, Ce, Ba, Pb) in 6 standard samples of rocks (US Geological Survey Standards: G‐2, GSP‐1, AGV‐1, BCR‐1, DTS‐1 and PCC‐1) are reported. These data are compared with those obtained from standard pellets and from

ISSN:0049-8246    

DOI:10.1002/xrs.1300030206

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

年代:1974

数据来源: WILEY

摘要:

AbstractA method for rapid and accurate X‐ray fluorescence analysis of a wide variety of slags from the copper producing industries has been developed. The samples are fused in a sodium tetraborate + lanthanum oxide flux with sodium nitrate added to ensure oxidizing conditions in the melt. Nine elements have been investigated, namely Cu, Zn, Fe, Si, Al, Pb, Sn, Ni and S. It has been found that simple linear calibrations give accurate results for most elements, but in the case of Cu, Zn, and Ni a correction procedure based on secondary mass absorption coefficients may sometimes be necessar

ISSN:0049-8246    

DOI:10.1002/xrs.1300030207

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

年代:1974

数据来源: WILEY

摘要:

AbstractThe effect of Compton scattered γ and X‐rays on fluorescent intensities is examined for heavier elements when using radioisotope excitation. It is shown to have a major effect in aqueous solutions and the implication of this on mathematical correction procedures is briefly discuss

ISSN:0049-8246    

DOI:10.1002/xrs.1300030208

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

年代:1974

数据来源: WILEY