Related Experiment Video
Updated: Jul 2, 2026

3D Imaging of Soft-Tissue Samples using an X-ray Specific Staining Method and Nanoscopic Computed Tomography
Published on: October 24, 2019
Detection of soft x rays with NEA III-V photocathodes
D Bardas1, E Kellogg, S Murray
1Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, Massachusetts 02138Light Sensing and Emitting Division, Varian Associates, Inc. 601 California Ave., Palo Alto, California 94303.
Abstract:
We describe the experimental energy response of a negative electron affinity (NEA) III-V photocathode to x rays with energies from approximately 0.8 to approximately 3 keV. Energy resolutions, E/DeltaE, from approximately 1 to approximately 3 are obtained, together with approximately 100% quantum efficiency. Theoretical calculations based on an electron diffusion model are shown to be in good agreement with the experimental results. The use of NEA III-V photocathodes as efficient soft x-ray detectors with good energy and spatial resolution is discussed for imaging applications in x-ray astronomy.
More Related Videos
11:27Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
Published on: December 8, 2016
10:48Probing Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices via Laser Flash Photolysis of Photoactivatable Nicotine
Published on: January 25, 2019
Related Concept Videos
Determination of Crystal Structures
X-ray Imaging
X-ray Diffraction of Biological Samples
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are scattered by the electron clouds around the sample atoms. The X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...