Correct. I guess it's a matter of degree. No one survives in a tank (or a bunker) that has been hit by a DU round... they are vaporized and turned into ash along with everything else in the tank. But the contamination is limited to the area immediately around the tank, a few dozen yards in all directions, but also it's caught in the wind and blown whatever direction the wind is blowing. But the contamination drops off as it disperses in an exponential rate, the further one is away from the destroyed tank (or bunker).

Here's a short video showing a DU round hitting various objects. In this case the DU round itself is contained inside a casing, and they also use tungsten darts to make the round even more lethal. Sort of a "gain of function" step. https://www.youtube.com/watch?v=U61Hrn1JZWQ&t=4s