Agnirva Space Premier League - Expedition #30756: Tracking Radiation Exposure During Spacewalks

When astronauts leave the International Space Station (ISS) for a spacewalk—or Extra Vehicular Activity (EVA)—they step into an environment with even higher exposure to space radiation. This radiation includes cosmic rays and solar particles that can pose serious health risks. The study titled "A Study of Radiation Doses Experienced by Astronauts in EVA" was developed to quantify exactly how much radiation astronauts absorb during these ventures outside the station.

Led by Ian Thomson and supported by the Canadian Space Agency (CSA) and NASA’s Johnson Space Center, the experiment took place during Expeditions 4, 5, and 6. The goal was to better understand EVA radiation risks so that future space missions, especially long-term ones to the Moon or Mars, can be better planned with astronaut safety in mind.

To measure radiation doses, astronauts were equipped with special dosimeters—devices that detect and record radiation levels. These dosimeters were worn on the outside of the EVA suits, as well as placed inside the suits, to record both external and internal exposure.

Results showed that radiation doses during EVAs were significantly higher than those experienced inside the ISS. Even with protective EVA suits, the radiation outside is more intense due to the lack of shielding provided by the station itself. These findings emphasized the need for better radiation protection strategies, including suit improvements and EVA time limitations.

The data collected helped space agencies refine safety protocols for astronauts. For example, planning EVAs during periods of lower solar activity, when radiation levels are naturally reduced, can help mitigate risks. It also highlighted the importance of advanced warning systems for solar flares, which can drastically increase radiation exposure.

Understanding radiation exposure is vital as we look ahead to deep-space missions. This research ensures we can continue pushing boundaries while safeguarding the health of our explorers.

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