Protecting Mars special regions with potential for life to propagate: Difference between revisions
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Protecting Mars special regions with potential for life to propagate (edit)
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* The UV flux is blocked by less than 1 mm of regolith or other organisms {{refn|name=UV|(see 3.5. Ultraviolet radiation on the surface of Mars page 901 of<ref name=MarsSpecialRegions2014/>).
{{quote|'''Finding 3-7''': The martian UV radiation environment is rapidly lethal to unshielded microbes but can be attenuated by global dust storms and shielded completelyby<1 mm of regolith or by other organisms.}} }}
* From the MSL RAD measurements, ionizing radiation levels from cosmic radiation are so low as to be negligible. The intermittent solar storms increase the dose only for a few days and the Martian surface provides enough shielding so that the total dose from solar storms is less than double that from cosmic radiation/ Over 500 years the Mars surface would receive a
{{quote|'''Finding 3-8''': From MSL RAD measurements, ionizing radiation from GCRs at Mars is so low as to be negligible. Intermittent SPEs can increase the atmospheric ionization down to ground level and increase the total dose, but these events are sporadic and last at most a few (2–5)days. These facts are not used to distinguish Special Regions on Mars.}}
{{quote|Over a 500-year time frame, the martian surface could be estimated to receive a cumulative ionizing radiation dose of less than 50 Gy, much lower than the LD90 (lethal dose where 90% of subjects would die) for even a radiation-sensitive bacterium such as E. coli (LD90 of ~200–400 Gy)}}
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