NASA Rover Curiosity Measures Questionable Radiation Levels for Human Mars Expedition
May 30, 2013 10:16 PM
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It's unknown what kind of health effects could come from such a trip
There's a lot of talk about humans living on Mars one day, but radiation levels discovered by NASA's Curiosity rover may spark a new investigation into what is an acceptable amount for people to tolerate over a period of time.
, which landed on the Red Planet on August 6, 2012, has been using a tool called a Radiation Assessment Detector to collect radiation samples while on Mars. The goal was to get an idea of how much radiation humans would be exposed to during a round trip to Mars.
Cary Zeitlin, NASA's principal scientist for the Martian Radiation Environment Experiment, found (through Curiosity) that humans could be exposed to between 554 and 770 millisieverts of ionizing radiation. This largely depends on the level of solar activity.
Americans typically receive about 6.2 millisieverts a year from both natural and man-made sources.
What does this mean, exactly? Zeitlin isn't entirely sure; as his team just makes measurements and doesn't decide what
radiation dose is considered safe
. The amount of radiation found falls in line with what was expected in a "deep space radiation environment," but as far as health goes, more information is needed.
Astronauts traveling to the moon receive about the same rate of radiation accumulation as those traveling to Mars, but since the Mars trip is so much longer than the moon's (the Apollo moon mission took about 8 days while the Curiosity Mars mission took about 253 days) the radiation levels may be more dangerous.
Zeitlin mentioned that there's no effective
method of shielding
that could block all of the high-energy particles from reaching the astronauts on a Mars mission.
There are also some studies that say radiation exposure is linked to cancer, and NASA tries to keep its lifetime fatal cancer risk to 3 percent for its astronauts.
NASA released a report in 2010 that said the average 35-year-old American male can safely spend between 140 and 186 days in deep space with heavy shielding while a 35-year-old female could spend between 88 and 120 days. For those who have never smoked, the 35-year-old man could spend between 180 and 239 days in deep space while a 35-year-old female could spend between 130 and 173 days. These figures keep them below the 3 percent cancer risk.
Zeitlin said the radiation astronauts would receive on a Mars trip would be comparable to getting an abdominal CT scan once every five days.
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CT Scan every 5 days?!?
5/31/2013 1:01:18 AM
A CT Scan is very HIGH energy. Roughly equivalent to 500 x-rays.
RE: CT Scan every 5 days?!?
5/31/2013 2:34:45 PM
That depends. A lower GI series is an x-ray exposure of about 8 mSv. A full body CT is about 10 mSv. Mars normal is like having weekly full body CTs.
The lowest annual exposure clearly known to be carcinogenic is 100 mSv. Mars normal is at least 3.5 times the known carcinogenic level and cancer risk would be very, very high. Short of a coronal mass ejection event, staying on Mars wouldn't kill you quickly....you'd die from cancer about 10 years later.
"Young lady, in this house we obey the laws of thermodynamics!" -- Homer Simpson
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