Performance of K -edge subtraction tomography as an application of parametric x-ray radiation

Abstract

We developed a novel method for element detection utilizing an x-ray source based on parametric x-ray radiation (PXR), an accelerator-based light source at the Laboratory for Electron Beam Research and Application (LEBRA), Nihon University. The method is a type of K-edge subtraction (KES) imaging that uses the drastic change of x-ray absorption around the K-shell absorption edge of the target element. Using the properties of PXR, simultaneous KES imaging is possible, and can easily be applied to 3-dimensional (3D) computed tomography (CT). We demonstrated the feasibility of simultaneous KES-CT in our previous work. In this study, we investigate the quantitative performance of simultaneous KES imaging for a sample containing the element strontium (Sr) for which the K-edge energy is 16.1 keV. Results of a simultaneous KES-CT experiment employing the LEBRA-PXR source confirm that the imaging method can provide a 3D distribution of the element with a value proportional to the Sr concentration. Concerning sensitivity to element concentration, at least in the region of 0.5%-concentration, the sample was successfully distinguished from the region without Sr in the 3D tomographic image obtained using the element-imaging technique.

Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations

“…As shown in Fig. 1a, the electron beam from the linac is supplied to two straight sections and used in each straight section for wavelength-tunable monochromatic light sources, namely an www.nature.com/scientificreports/ infrared FEL and a parametric X ray 12,13 . As described in the Method section, a coupler device that can extract the CER beam generated at the downstream bending magnet without losing the FEL beam was installed in the optical cavity 8 .…”

A proof-of-principle experiment on a new diagnostic tool for determining beam sizes from angular distributions of parametric X-ray radiation

“…When relativistic charged particles are incident on a single crystal, PXR is emitted in the Bragg direction and can be regarded as the diffraction of virtual photons associated with the incident particles ( [8][9][10][11][12][13] and the literature cited therein). Since its first observation in the 1980's, PXR has been investigated theoretically and experimentally, and some groups have performed studies applying PXR as a new wavelength-variable monochromatic X-ray source [14,15]. A number of experiments on beam diagnostic methods using PXR have also recently been performed [7,16,17].…”