Near K-edge measurement of the X-ray attenuation coefficient of heavy elements using a tuneable X-ray source based on an electron LINAC

Studies on mass attenuation coefficients, effective atomic numbers and electron densities for CoCuAg alloy thin film

“…The variation of Z eff and N el with photon energy for the thin film of CoCuAg alloy is tabulated in table 2 and is shown graphically in figures 3 and 4, respectively. Table 2 figures 3 and 4 show that Z eff changes with the photon energy, so N el changes with the photon energy because N el is linearly proportional to Z eff as can be seen in equation (8) of Cu and Ag. These values also increase abruptly in the K absorption edge of Ag.…”

“…Yi et al [7] calculated the mass attenuation coefficients of beta particles using semi-empirical calculations. Materna et al [8] performed near K -edge measurement of x-ray attenuation coefficients of bismuth and uranium using a tuneable hard x-ray source based on the linear electron accelerator. Moreover, there are many studies on the mass attenuation coefficients, ranging from determining the energy and composition dependences of the mass attenuation coefficient of building materials to determining the mass attenuation coefficients of Earth, Moon and Mars samples [9][10][11][12][13][14][15][16][17].…”

Performance Evaluation of the ORNL Multi-Elemental KED (MEKED) Analysis Algorithms

“…The accuracy of these coefficients ultimately limits the performance of the spectral fitting MEKED. The attenuation coefficients could be verified by direct measurement, such as attempted by Materna et al [9], or by analysis of a collection of HKED spectra from different facilities.…”

“…In our representation of the KED response function, we incorporate the mass attenuation data from the National Institute of Standards and Technology XCOM Photon Cross Sections Database [5] and assume for the present that these values have no uncertainty. These cross-section tables provide a delta function step at the K-Edge transition, whereas others assume that the K-Edge transition is Lorentzian broadened [9] [14] [15] [16]. We have found that a mixture of the two assumptions provides the best empirical representation for the KED response function.…”