An extrapolation method for the determination of Cliff‐Lorimer kAB factors at zero foil thickness

Zenji Horita, Takeshi Sano, Minoru Nemoto

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    An extrapolation method is proposed to be useful for the determination of the Cliff‐Lorimer kAB factor at zero foil thickness. The method consists of measuring kAB factors as a function of the measured foil thickness, tM, and extrapolating the relationship toward tM=0. The intersection between the extrapolated line and the ordinate of tM=0 gives (kAB)0 which is free from the effect of absorption. The straight line extrapolation that can be achieved by a linear‐least squares method is particularly developed to eliminate arbitrariness introduced in the extrapolation process. The extrapolation method is applied to data available in the literature. It is shown that the method yields the (kAB)0 factors compatible with those predicted from the theoretical calculation. It is also shown that this method can circumvent several problems which make it complex and difficult to determine accurate values of the absorption‐free kAB factors. Using the straight line extrapolatioin, it is possible to estimate the degree of the thickness overestimation which arises when the foil thickness is measured by the contamination spot separation (CSS) method. Validity of the straight line extrapolation is further discussed. 1986 Blackwell Science Ltd

    Original languageEnglish
    Pages (from-to)215-231
    Number of pages17
    JournalJournal of Microscopy
    Issue number3
    Publication statusPublished - Sept 1986

    All Science Journal Classification (ASJC) codes

    • Pathology and Forensic Medicine
    • Histology

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