In flight, it can be shielded with water and polyethylene, which would be needed anyway by colonists. On the surface, as someone else noted, you want good groun

In flight, it can be shielded with water and polyethylene, which would be needed anyway by colonists. On the surface, as someone else noted, you want good ground contact for heat dissipation so you might as well throw it into a hole and bury it, dirt being plentiful.