Rugged High Performance X-ray Tube

Robust, reliable, high flux x-ray sources have been long sought for a variety of applications including for sources capable of replacing radioisotope source-based irradiators in a range of applications. Stable operation under challenging environmental conditions, including varying temperatures, long term storage, intermittent power, and power surges is required. Rivis, Inc is developing an x-ray source based upon a new rugged high current cathode that overcomes historical barriers. It does not use low work function materials which are susceptible to trace gaseous impurities and to back-ion bombardment, does not require ultrahigh vacuum, and is not impacted by vibration, temperature changes or intermittent power. Its use as a cathode in an x-ray tube provides a robust, reliable x-ray source for use in resource limited environments. As a result of Phase I experiments, among the highest reported electron beam currents was demonstrated. Both high current per pulse and high average current have been demonstrated. Broad area beams for x-rays production over a panel are possible with the potential for improved x-ray flux uniformity, a focus for Phase II. In Phase I specific features of the source for high x-ray flux generation were refined to optimize the performance but further development is necessary. The materials selection for optimum cathode and x-ray performance were evaluated. High current cathodes are critical components for x-ray tubes. X-ray sources may replace radioisotope source-based irradiators in a wide range of applications including medical device sterilization, cargo screening, and materials processing. Productivity is directly related to the x-ray flux. Rugged high current cathodes will increase x-ray flux and productivity.