A pulsed precision x-ray source includes a miniaturized internally self-shielding x-ray tube and an integral generator contained in a hand-held housing for generating timed bursts of x-ray having regulated energy level. A control grid and focus electrode within the tube enable precise on-off control...http://www.google.com/patents/US5077771?utm_source=gb-gplus-sharePatent US5077771 - Hand held high power pulsed precision x-ray source
