Technique to Determine Intense Electron Beam Parameters and X-Ray Spectra From Dose-Rate Measurements at Different Angles

A new technique can determine far-field X-ray spectra produced by intense pulsed electron beams (e-beams). Dose-rate measurements at three different angles of observation determine the e-beam voltage, current, and angle of incidence, all as functions of time. A Monte-Carlo code using the inferred e-beam parameters can then calculate the far-field spectrum at any point in space and time. The technique is described using a 2-MV example (Gamble II) and an 8-MV example (radiographic integrated test stand (RITS)-6). Error-propagation analyses estimate the uncertainty in the parameters inferred from the dose-rate measurements.