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The diagram indicates a main radiation exposure of 20mrad/d = 1.7 Gy/a. JPL reported that MARIE-measured radiation levels were two to three times greater than at the International Space Station (which is 100-200mSv/a). Levels at the Martian surface might be closer to the level at the ISS due to atmospheric shielding -- ignoring the effect of thermal neutrons induced by GCR. Average in-orbit doses were about 400-500mSv/a. However occasional solar proton events (SPEs) produce a hundred and more times higher doses, see diagram above. SPEs were observed by MARIE that were not observed by sensors near Earth, confirming that SPEs are directional.
Read more about this topic: Mars Radiation Environment Experiment
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