The images above show that: (i) There is less radiation at lower elevations, and (ii) there are spikes in radiation caused by solar flares. Some ways to mitigate the radiation hazard may be:
1) Establish settlements at lower elevations
2) Build solar storm shelters
3) Shield settlement structures
4) Live underground
A combination of these may be optimal, such as "a settlement at low elevation with partial shielding of some structures and subsurface living quarters that double as solar storm shelters", depending on how much radiation is deemed acceptable.