Share Email Print
cover

Proceedings Paper

Liquids identification with x-ray diffraction
Author(s): G. Harding; J. Delfs
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

A novel identification technique suited to security screening of liquid and amorphous substances with x-ray diffraction (XRD) is presented. The starting point is to fit the high momentum region (independent atom regime) of the XRD profile with a free-atom scatter function corresponding most closely to the effective atomic number of the sample. The Percus-Yevick formulation of the molecular interference function for hard-sphere liquids then enables features to be extracted from liquid/amorphous XRD profiles. These features correspond to such molecular structure parameters as effective particle radius, packing fraction, effective atomic number, particle homogeneity and inter-particle potential. Amorphous substances may thus be classified into functional groups such as oxidisers and fuels. These considerations are illustrated with synchrotron XRD measurements of acetone and hydrogen peroxide, implicated in the London "transatlantic aircraft plot" of 2006 and representative of hazardous liquid fuel and oxidizer combinations.

Paper Details

Date Published: 24 September 2007
PDF: 12 pages
Proc. SPIE 6707, Penetrating Radiation Systems and Applications VIII, 67070T (24 September 2007); doi: 10.1117/12.740290
Show Author Affiliations
G. Harding, GE Security (Germany)
J. Delfs, Univ. of Hamburg (Germany)


Published in SPIE Proceedings Vol. 6707:
Penetrating Radiation Systems and Applications VIII
F. Patrick Doty; H. Bradford Barber; Hans Roehrig, Editor(s)

© SPIE. Terms of Use
Back to Top