Improved ratio method for x-ray densitometry

Geoffrey L. Harding; R. Armstrong; Sharon M. McDaid; Malcolm J. Cooper

doi:10.1117/12.180022

12 July 1994 Improved ratio method for x-ray densitometry

Geoffrey L. Harding, R. Armstrong, Sharon M. McDaid, Malcolm J. Cooper

Proceedings Volume 2278, X-Ray and UV Detectors; (1994) https://doi.org/10.1117/12.180022
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

The ratio method, in which the elastic x-ray scatter signal I_e from a localized region of bulk material is normalized against the Compton scatter I_c, has been widely evaluated as a densitometric technique for evaluating mean atomic number. An analysis is presented of two major error sources influencing the ratio method. It is shown that a forward scattering geometry minimizes errors of both types for substances composed of low and medium Z elements. We describe a novel technique in which a K edge filter is used to separate small angle elastic and Compton scatter induced in a sample on irradiation with the FLUOREX fluorescent x-ray source. The feasibility of this method is demonstrated by first experimental results. The potential application of this technique to the problem of explosives detection is briefly discussed.

Citation Download Citation

Geoffrey L. Harding, R. Armstrong, Sharon M. McDaid, and Malcolm J. Cooper "Improved ratio method for x-ray densitometry", Proc. SPIE 2278, X-Ray and UV Detectors, (12 July 1994); https://doi.org/10.1117/12.180022

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