Mars receives about the same amount of cosmic radiation as Earth. The difference is that Earth has a magnetosphere that deflects most of this radiation away from the surface. Mars does not have a magnetosphere, so the radiation is not deflected.

Astronauts on Mars would be exposed to about 10 times the amount of radiation that astronauts on Earth are exposed to. This would increase their risk of cancer and other health problems.

To protect astronauts from radiation on Mars, they would need to live in specially-designed habitats that would shield them from the radiation. These habitats would be made of thick materials, such as lead, that would absorb the radiation.

Astronauts would also need to wear protective clothing when they were outside of their habitats. These clothes would be made of materials that would reflect or absorb the radiation.

In addition to these precautions, astronauts would need to limit their time spent on the surface of Mars. The longer they were exposed to the radiation, the greater their risk of health problems would be.

By following these precautions, astronauts can reduce their risk of radiation exposure on Mars. However, it is important to note that there is no way to completely eliminate the risk of radiation exposure on Mars.