Method for the identification of substances by the ratio of the intensity of coherent to incoherent scattering

• Published in: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2020-05, Vol.471, p.48-52
• Main Authors: Mikhailov, I.F., Mikhailov, A.I., Baturin, A.A., Fomina, L.P.
• Format: Article
• Language: English
• Subjects: Calibration plots; Effective atomic number; Light elements; Rayleigh-to-Compton scattering intensity ratio; Stoichiometric compounds
• ISSN: 0168-583X; 1872-9584
• DOI: 10.1016/j.nimb.2020.03.033

A method is proposed to identify the compounds based on chemical elements with low atomic number from the dependence of the intensity ratio of coherent (Rayleigh) and incoherent (Compton) scattering IR/IC on the momentum transfer variable sinθλ. The results of experimental measurements of this ratio are presented for primary radiation with photon energies (keV): 9.88, 10.98, 11.22, 12.49, 14.95, 16.73, 17.47, 19.60, and 22.16 in the range of 0.686Å-1⩽sinθλ⩽1.631Å-1. The measurements were performed by the scattering spectra of one-component standard samples of beryllium, boron, and carbon, as well as multi-component stoichiometric standards based on H, Li, B, C, O, and F. The scattering spectra were measured using EDXRF and WDXRF spectrometers. For each xsinθλ the dependences of IR/IC on the atomic number Z for one-component standards were obtained. These dependences were used as the calibration functions for determining Zeffx of the multicomponent substance. It is shown that multicomponent substances based on light elements can be identified from Zeffx.