| 摘要 |
PROBLEM TO BE SOLVED: To provide a radiation generating device in which out-of-focus radiation is reduced.SOLUTION: In a radiation generating device including an electron radiation source having an electron radiation part, a target having a target layer generating radiation by receiving irradiation of an electron beam radiated from the electron radiation part, and a base material for supporting the target layer and transmitting the radiation, where the electron radiation source and the target layer are located to face each other, a radiation generating tube located on the electron radiation source side of the target and including a tubular rear shield having an electron incident port, and a collimator defining the radiation takeoff angle on the reverse side of the electron radiation source side of the target, a radiation generating device is further provided with a variable mechanism connected with the collimator and varying the opening diameter of an opening, and the target layer includes a portion where the rim is located separately from the rim of the base material. |
