An x‐ray imaging technique has been studied for the purpose of observing the current density profile in a high‐current relativistic electron beam (50 MeV, 10 kA). Calculations and measurements of energy spectra and intensities are in good agreement. Results indicate sufficient photon yield for pinhole imaging when the beam deposits a small part of its energy in high‐Zgas or a thin high‐Zfoil. CharacteristicLandKx‐ray emission is not found not be a reliable technique due to strongLandKshell fluorescence in the presence of intense bremsstrahlung radiation. It is also found that at pressures on the order of one atmosphere, the density of energy deposition in a gas cell is too small to generate sufficient photon yield for time‐resolved measurements.
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