Influence of the incident beam on integrated intensities in X-ray energy-dispersive diffractometry

Abstract

Polarization measurements of the primary X-ray beam produced by thick copper and tungsten anodes are reported and formulas derived for integrated intensities of Bragg reflections in energy-dispersive diffractometry with the polarization of the primary beam taken into account. It was found that for an angle of 45° between the scattering plane and the plane containing the electron beam and the primary beam, the influence of polarization vanishes, while it increases as the angle changes from 45 ° to either 0 or 90 °. For the latter values, the influence of polarization is considerable at high photon energies and at scattering angles close to 90 ° .

Characterization of breast tissue using energy-dispersive X-ray diffraction computed tomography

“…Moreover, because of the low scatter angle involved for the present experiment, it was found that even the largest absolute value of polarization measured by Olsen et al (1978) would only bring a maximum correction of less than 0.5% to the highest energy components.…”

Structure study of amorphous lead titanate by the energy-dispersive X-ray diffraction method

“…Since the polarization P(E) is almost constant in our energy range (Olsen, Buras & Jensen, 1978), an approximation Cr(E , O) ~-Cp(O) holds. Thus the intensity distribution l(s, Oi) at 0i is obtained from (3).…”

Structure of magnetic amorphous alloys studied by energy dispersive X-ray diffraction

“…2 E' E 2 (6) was found to be significantly E dependent at high angles [IO,52].To avoid this complication it is recommended to tilt the X-ray tube 45 0 away from the plane which includes incident and diffracted beams. The polarization factor is then independent of E, so that if we define p piE} (7) the expression (3) becomes much simplified:…”