Oh, I meant on the rover. From googling, it seems the helicopter's design lifetime is too short for radiation damage to matter, and the cameras actually on the rover are rad-hardened to some degree.
Generally cameras are reasonably rad-hard because the pixel size dictates a lot of the wiring size (and puts a lower bound on the process size). 3.5um pixels don't play well with 5nm features. Bigger features are generally more resistant to radiation fun.
Rad hard cameras intended for long term operation use CCDs with the drivers and ADCs off chip, implemented in a hardened process.