The surface of the chunk of rock facing such a radioactive blast could be shaved off before it somehow has its trajectory changed towards where heavier processi

The surface of the chunk of rock facing such a radioactive blast could be shaved off before it somehow has its trajectory changed towards where heavier processing equipment is orbiting. Such a "harbor" would have to "speed up" to match this incoming new orbital body of rock, with supply launches necessary along this planned path (pre fired before new heavy tonnage arrives). Fuel shipments necessary to slow the entire rock shipment (constant thruster firing for days or weeks, affixed to the surface of the decontaminated asteroid slice). How far does radiation penetrate through rock? Some YouTube video virtually demonstrated using regolith as automated 3D printed habitat above ground structure protection from radiation in a place with no ionosphere.