PROBLEM TO BE SOLVED: To provide a radiation generation tube 1 in which an electrode 2 connected with an electron emission source 3 and an electrode 4 connected with a target 5 for generating radiation by irradiating electrons from the electron emission source 3 are attached to both opening ends of an electrically insulating tubular member 6 to configure a vacuum vessel, and in which possibility of dielectric breakdown is lowered while enhancing the radiation stability and reliability, by relaxing electric field concentration at the electrode end in the joints of the electrodes 2, 4 and the tubular member 6.SOLUTION: An annular protrusion 21 is formed on the outer periphery of a tubular body 6 in the circumferential direction, and annular recesses 22 recessed farther inner peripheral side than a surface connecting the outer peripheral surfaces at both ends of the tubular body 6 contiguous to both electrodes 2, 4 are formed, in the circumferential direction, in the outer periphery of a tubular body 6 between the electrodes 2, 4 and the protrusion 21.COPYRIGHT: (C)2014,JPO&INPIT【課題】電子放出源3が接続された電極2と、電子放出源3からの電子の照射で放射線を発生させるターゲット5が接続された電極4とが、電気的に絶縁性の管状部材6の両開口端に取り付けられて真空容器を構成している放射線発生管1において、電極2,4と管状部材6の接合箇所における電極端部の電界集中を緩和し、絶縁破壊の可能性が低く、かつ放射線出力安定性及び信頼性の高い放射線発生管1を提供する。【解決手段】管状部材6の外周の周方向に環状の凸部21を形成し、電極2,4と凸部21との間の管状部材6の外周の周方向に、両電極2,4に隣接する管状部材6の両端部の外周面を結ぶ面よりも内周側へ窪んだ環状の凹部22を形成する。【選択図】図1
