摘要:

AbstractThis work is aimed at providing a direct analytical method for powdered materials collected on cellulose filters. The origin and composition of these materials may be very different. The analytical technique employed was X‐ray fluorescence spectrometry without preliminary treatment of samples.It is known that different thickness of thin deposits, due for example to different sampling condition, cause some difficulties on the correct accomplishment of the analysis. To eliminate this drawback the basic principles characterising the behaviour of X‐ray penetration in the matter, were developed, thus leading to some equations, applicable to the analysis of the following kinds of samples: (a) sample of infinite thickness for X‐ray penetration; (b) sample of finite thickness below the critical value; (c) sample of infinite thickness placed over the sample of finite thickness.The equation relating to case (c) was then applied to the analysis of powdered materials collected on cellulose filters.A suitable plate of a selected metal was placed over the sample, and the fluorescence radiations intensity values of the element to be analysed were recorded together with the intensity of the radiation emitted by the plate.By substituting some terms of the above mentioned equation with experimental data, X‐ray intensity values were corrected, and then independent measurements were performed on the sample thickness.This work described both the theoretical part and the experimental procedures with results showing the method's reli

ISSN:0049-8246    

DOI:10.1002/xrs.1300030109

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

年代:1974

数据来源: WILEY

摘要:

AbstractThe results are presented of an intercomparison study between twelve investigators and three analytical techniques. The objective was to determine the precision and accuracy with which multi‐element analysis of air particulates on filters can be accomplished using energy dispersive X‐ray fluorescence spectrometry. Special emphasis was placed on testing calibration techniques and methods of correction for absorption in both particulate deposits and substrates. Results indicate that errors in calibration and correcting for substrate absorption can be reduced to much less than 10% for elements K and above, but the more work is required to test methods of correcting for particles size to achieve 10% accuracy at energies below 3

ISSN:0049-8246    

DOI:10.1002/xrs.1300030110

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.1300030101

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

年代:1974

数据来源: WILEY