| 摘要 |
In computerized axial tomography employed with large relatively dense objects 45 such as a solid fuel rocket engine, using high energy x-rays, such as a 15 MeV source, a collimator 30 is employed with an acceptance angle substantially less than 1 DEG , in a preferred embodiment 7 minutes of a degree. In a preferred embodiment, the collimator may be located between the object and the detector, although in other embodiments, a pre-collimator may also be used, that is between the x-ray source and the object being illuminated. <IMAGE> |
