[B._Beckhoff,_et_al.]_Handbook_of_Practical_X-Ray_(b-ok.org).pdf

8 182 1979 68 coedo ag dorado mt rivero cj cobo ig

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8 , 182 (1979) 68. Coedo AG, Dorado MT, Rivero CJ, Cobo IG, Analyst 119 , 421 (1994) 69. Cobo IG, Dorado MT, Coedo AG, J Trace Microprobe Technol 13 , 431 (1995) 70. T¨olg GZ, Anal Chem 190 , 161 (1962) 71. Zagorodniy VV, X-Ray Spectrom 32 , 40 (2003) 72. Kitov BI, Smagunova AV, Portnov MA, Zh Anal Khim 45 , 1927 (1990) 73. Smagunova AN, Rozova OF, Prekina IM, Zh Anal Khim 49 (No. 7), 711 (1994) 74. Mzyk Z, Baranovska I, Mzyk J, X-Ray Spectrom 31 , 39 (2002). 75. Tertian R, Claisse F, Principles of Quantitative X-Ray Fluorescence Analysis Wiley-Heyden, London (1982)
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7 Methodological Developments and Applications 7.1 Micro X-Ray Fluorescence Spectroscopy B. Kanngießer, M. Haschke 7.1.1 Introduction Micro X-ray fluorescence spectroscopy (micro-XRF) is one of the latest and very dynamic branches of X-ray fluorescence spectroscopy. Here “micro” indi- cates that localised regions of a sample are investigated with spatial resolution on the micrometer scale. Micro-XRF has developed very rapidly in the last decade, mainly due to the use of synchrotron radiation. The reason for that preference is the by far higher intensity of synchrotron radiation in compari- son to X-ray tube radiation. The first arrangements employed collimators that could only use a small fraction of the emitted radiation for the excitation. The next step involved the use of mono-capillary optics, but also in this case the amount of radiation brought onto the sample is limited by the small entrance diameter of the capillary. Despite the lower intensity delivered by X-ray tubes bench-top instruments with tube excitation have come into use for micro-XRF over the last years. For these instruments it is necessary to closely couple X-ray optics to the tube window in order to concentrate a large portion of the tube radiation into a small sample area [1–3, 5]. Typically, capillary optics–especially polycapillary lenses–are in use for that purpose.
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