Radiation poses risks for Mars astronauts
An astronaut on a mission to Mars could receive radiation doses up to 700 times higher than on our planet – a major showstopper for the safe exploration of our solar system. A team of European experts is working with ESA to protect the health of future crews on their way to the moon and beyond.
Earth’s magnetic field and atmosphere protect us from the constant bombardment of galactic cosmic rays – energetic particles that travel at close to the speed of light and penetrate the human body.
Cosmic radiation could increase cancer risks during long duration missions. Damage to the human body extends to the brain, heart and the central nervous system and sets the stage for degenerative diseases. A higher percentage of early-onset cataracts have been reported in astronauts.
Physicist Marco Durante, who studies cosmic radiation on Earth, explained, "One day in space is equivalent to the radiation received on Earth for a whole year. The real problem is the large uncertainty surrounding the risks. We don’t understand space radiation very well and the long-lasting effects are unknown."
Marco points out that most of the changes in the astronauts’ gene expression are believed to be a result of radiation exposure, according to the recent NASA Twins Study. This research showed DNA damage in astronaut Scott Kelly compared with his identical twin and fellow astronaut Mark Kelly, who remained on Earth.
A second source of space radiation comes from unpredictable solar particle events that deliver high doses of radiation in a short period of time, leading to ‘radiation sickness’ unless protective measures are taken.
"Space radiation research is an area that crosses the entire life and physical sciences area with important applications on Earth. Research in this area will remain of high priority for ESA," explained Jennifer Ngo-Anh, ESA’s team leader human research, biology and physical sciences.
While astronauts are not considered radiation workers in all countries, they are exposed to 200 times more radiation on the International Space Station than an airline pilot or a radiology nurse.
Radiation is in the Space Station’s spotlight every day. A console at NASA’s mission control in Houston, Texas, is constantly showing space weather information.
If a burst of space radiation is detected, teams on Earth can abort a spacewalk, instruct astronauts to move to more shielded areas and even change the altitude of the station to minimise impact.
One of the main recommendations of the topical team is to develop a risk model with the radiation dose limits for crews travelling beyond the ISS.
ESA has teamed up with five particle accelerators in Europe that can recreate cosmic radiation by ‘shooting’ atomic particles to speeds approaching the speed of light. Researchers have been bombarding biological cells and materials with radiation to understand how to best protect astronauts.
ESA has been measuring the radiation dose on the ISS for seven years with passive radiation detectors in the DOSIS 3D experiment. ESA astronauts Andreas Mogensen and Thomas Pesquet wore a new mobile dosimeter during their missions that gave them a real-time snapshot of their exposure.
The same European team behind this research will provide radiation detectors to monitor the skin and organ doses of the two phantoms travelling to the moon onboard NASA’s Orion spacecraft.
ESA has demonstrated expertise in studying Mars from orbit, now we are looking to secure a safe landing, to rove across the surface and to drill underground to search for evidence of life. Our orbiters are already in place to provide data relay services for surface missions. The next logical step is to bring samples back to Earth, to provide access to Mars for scientists globally, and to better prepare for future human exploration of the Red Planet.
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