X-ray photon-in/photon-out methods for chemical imaging

Synthesis and characterization of Gd2O2 S: Tb3+ phosphor powder for X-ray imaging detectors

Gadolinium oxysulfide phosphor doped with trivalent terbium have been synthesized using urea homogenous precipitation and followed by sulfurization at 800 °C under argon atmosphere. Structural and morphological of synthesized phosphor powder were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FT-IR). Hexagonal structure ...

Single Photon Counting X-Ray Imaging Through Gigabit Ethernet Transmission

High-performance computing capability enabled the development of a multi-energy X-ray imaging system which includes a data-acquisition, preprocessing and transmission module, followed by image reconstruction module. The data acquisition, pre-processing and transmission module are located at the pixel sensor side, and the image reconstruction is completed by using a GPU on a host PC. Thus, it re...

Single Photon Counting X-Ray Micro-Imaging of Biological Samples

Photon-in photon-out hard X-ray spectroscopy at the Linac Coherent Light Source

X-ray free-electron lasers (FELs) have opened unprecedented possibilities to study the structure and dynamics of matter at an atomic level and ultra-fast timescale. Many of the techniques routinely used at storage ring facilities are being adapted for experiments conducted at FELs. In order to take full advantage of these new sources several challenges have to be overcome. They are related to t...

X-ray Photon Counting and Two-Color X-ray Imaging Using Indirect Detection

In this paper, we report on the design and performance of a 1 cm², 90 × 92-pixel image sensor. It is made X-ray sensitive by the use of a scintillator. Its pixels have a charge packet counting circuit topology with two channels, each realizing a different charge packet size threshold and analog domain event counting. Here, the sensor's performance was measured in setups representative of a medi...