OT: Ceres more interesting than previously thought

[Kamog]

I thought depleted uranium emits its own radiation, doesn't it? So although it may stop outside radiation, it probably won't be very healthy to live inside walls made of the material. Also, I don't understand why radiation that passes through the human body won't do any damage. Wouldn't it still do damage as it passes through, just like a bullet that passes through the body?