X rays are refracted away from the normal at the refracting surface. It is possible that X rays are the results of torus photons and collapsing at the refracting surface send them into the past with greater than light speed, \(c+v_{boom}\). This means a X ray setup need to be orientated with respect to earth's movement (Eastward) such that the future position is into the material to be examined.
If time travel into the past is the reason why X rays are penetrating, then in the westward direction, X rays will fail to penetrate as the future position is behind the X ray source away from the subject material refracting surface.
Conversely, in the eastward direction, X rays are most penetrating. In a vertical position, X rays exposures are intensified in the eastward direction. X ray source seems to be more intense eastward.
and the danger of being stuck in a wall on return from light speed is very real...
Why else should X rays be penetrating?