ExoMars measured radiation levels on the way to Mars

One of the main risks for the crew of a potential Martian expedition is radiation. During the many-month flight, astronauts will be exposed to higher doses of radiation than during missions in near-earth orbit. But how big is the danger?
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At the annual European Congress of Planetary Sciences in Berlin, the experts of the ExoMars mission announced the results of measurements of the radiation situation on the way to Mars. They were carried out by the Lyulin-ML dosimeter, which is part of the FREND neutron detector installed on board the TGO station (Fine Resolution Epithermal Neutron Detector). The instrument showed that during the six-month flight to Mars and the return to Earth, the crew of the spacecraft will receive a dose of radiation equivalent to 0.66 ± 0.12 sievert. For comparison, the maximum dose limit, which is considered acceptable for the entire time of the astronaut's career, is 1 sievert.
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According to a recent press release from Roskosmos, for five months of flight the average flux of galactic cosmic rays was 3.1 - 3.3 particles per square centimeter per second,The absorbed dose of silicon was 370 - 390 micro-grades per day. When TGO was in a highly elliptical orbit, the equivalent dose was about 2.2–2.3 millisievert per day. The dose decreased due to the "shadow" of Mars, which partially covered the device from cosmic rays. The first measurements in a low circular orbit with an altitude of about 400 km above the surface showed a further decrease in the radiation level. Now it is about 1.5 - 1.6 millisievert per day.
ExoMars measured the level of radiation on the way to Mars time, space, radiation, orbit, crew, near, activity, rays, can, big, flight, radiation, galactic, flight, receive, amounts, millisievert, measurements, Mars, mission

It is worth noting that the measured TGO radiation level in the interplanetary space was approximately 20% higher than during the flight of the Curiosity rover (2011 - 2012). This is due to the fact that TGO flew during a minimum of solar activity. During these periods of time, more galactic cosmic rays penetrate into the solar system.
ExoMars measured the level of radiation on the way to Mars time, space, radiation, orbit, crew, near, activity, rays, can, big, flight, radiation, galactic, flight, receive, amounts, millisievert, measurements, Mars, mission

At the same time, flights during periods of increased activity of our luminary are fraught with even greater risk. If the ship is in the path of a powerful solar emission, the crew can receive very serious doses of radiation at a time. To protect themselves from such threats, engineers are proposing to equip manned Martian ships with an anti-radiation shelter.An alternative to this may be the use of new types of propulsion systems that can significantly reduce the time of interplanetary travel and, as a result, reduce the radiation dose that the crew will receive during the mission.

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