摘要:

AbstractThe News and Events section is designed to provide readers with a comprehensive and up‐to‐the‐minute current awareness service. It contains information on new instruments and equipment, changes in personel, etc. Further information concerning any item in these pages can be obtained by circling the relevant number on the reader service card. Any contributions which may be of interest to this section should be submitted to either the News and Events Editor — Colin Dann — at the publisher's London Office, or to any Region

ISSN:0049-8246    

DOI:10.1002/xrs.1300010114

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

年代:1972

数据来源: WILEY

摘要:

AbstractAn attempt has been made to evaluate on the basis of simple physical theories the principal possibilities and limitations of the X‐ray fluorescence method in determining both principal components and other alloying elements as well as impurities in relatively complex alloy systems. The text refers specifically to the analysis of copper‐based alloys, but the principles are general ones and the arguments can easily be applied to other syst

ISSN:0049-8246    

DOI:10.1002/xrs.1300010103

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

年代:1972

数据来源: WILEY

摘要:

AbstractEs werden die Gleichungen fur die Primä, Sekundär‐ und Tertiäranregung bei der RFA verwendet, um aus Analogiebetrachtungen die Verhältnisse bei der Einfach‐, Zweifach‐ und Dreifachstreuung quantitativ behandeln zu können. Der charakteristische Quotient aus körent und inkohärent gestreuter Intensität wird sodann fur verschiedene Kohlenwasserstoffe berechnet und mit den experimentell gefundenen verglichen. Die Ursachen für den etwa 15 Prozent betragenden Unterschied wer

ISSN:0049-8246    

DOI:10.1002/xrs.1300010104

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

年代:1972

数据来源: WILEY

摘要:

AbstractThe usefulness of the analysing crystal is generally governed by its angular dispersion and reflecting power. This is particularly so today where the increasing requirement for more speed and greater accuracy can often only be obtained by the availability of higher net intensities. Although the performance of the conventional X‐ray spectrometer is satisfactory in the middle portion of the wavelength range, it lacks dispersion at the short wavelength end and sensitivity at the long wavelength end. For this reason, there is a continuing search for crystals which offer more angular dispersion in the 0.2 to 2 Å range and better reflecting power in the 5 to 20 Å region.This paper discusses results obtained with some of the newer analysing crystals which have become available during the past couple of years. These crystals include pyrolitic graphite, rubidium acid phthalate, sorbitol hexa‐acetate, and the (420) and the (422) cuts of lithium flu

ISSN:0049-8246    

DOI:10.1002/xrs.1300010105

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

年代:1972

数据来源: WILEY

摘要:

AbstractIn the general application of the X‐ray spectrographic method, it is often difficult to obtain standards which closely approximate the unknown being analysed. One of the possible ways around this problem is to utilise a matrix correction procedure which does not, in principle, require large numbers of standard samples. One such method has been described by Birks and Criss and this paper describes the application of their program at the University of Florida where a wide variety of samples are encountered. Also discussed in the paper is the basis of the so‐called ‘Fundamental Parameter’ method which has provided the means of analysing with great accuracy certain binary and tertiary alloys. It seems that the method holds considerable promise for the analysis of ore deposits and the prediction of inter‐elemen

ISSN:0049-8246    

DOI:10.1002/xrs.1300010106

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

年代:1972

数据来源: WILEY

摘要:

AbstractAn instrument is described which permits thin‐layer chromatograms to be scanned in a commercial X‐ray fluorescence spectrometer. The detection of phosphorus, sulphur, chlorine and iodine has been investigated, but the application of the instrument is not restricted to these elements, for which lower limits of detection of about 2 μg were f

ISSN:0049-8246    

DOI:10.1002/xrs.1300010107

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

年代:1972

数据来源: WILEY

摘要:

AbstractThe preparation of pellets of powdered geological samples is a critical step in X‐ray fluorescence analysis. A special die has been designed to produce smooth surfaces on extremely durable pellets and to provide a protective, hard outer ring and backing. The outer ring minimises the deterioration of the edge that has in the past limited the usable life of the pellet. Repetitive preparations have shown reproducibility and homogeneity to be within normal counting statistic

ISSN:0049-8246    

DOI:10.1002/xrs.1300010108

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

年代:1972

数据来源: WILEY

摘要:

AbstractOne of the current problems in the application of the X‐ray spectrometer is the training of operators in the use of instrumentation and techniques. One of the usual consequences of rapid expansion in the use of any instrumental procedure is the lack of general experience and expertise, and in this X‐ray spectrometry is no exception. As a technique it has only recently been introduced into the syllabus of the appropriate university course of study and, at the present time, this only at a very few universities. Training in X‐ray spectrometry has therefore become very much an extra‐mural course of study and among the more successful groups to offer courses in the U.S.A. has been the State University of New York at Albany. The following short report by Professor Chessin gives an informal description of the background of his ‘Clinics’ and describes some of his

ISSN:0049-8246    

DOI:10.1002/xrs.1300010109

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.1300010112

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.1300010113

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

年代:1972

数据来源: WILEY