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EVA dosimetry in manned spacecraft
1Thomson & Nielsen Electronics, 25E Northside Road, Nepean, Ontario, Canada. ithomson@thomson-elec.com
Mutation Research
|January 13, 2000
Summary
Astronauts face significant radiation exposure during spacewalks (Extra Vehicular Activity). This study quantifies these doses, revealing variability due to suit shielding and orbit, and proposes in-flight measurements for crew safety on the International Space Station.
Area of Science:
- Space Science
- Radiation Biology
- Astronaut Health
Background:
- Long-duration space missions pose significant radiation health risks to astronauts.
- Radiation doses during Extra Vehicular Activity (EVA) are not fully quantified.
- Understanding EVA radiation exposure is critical for astronaut safety.
Purpose of the Study:
- To review the space radiation environment and current dose limits.
- To quantify radiation doses received during EVA.
- To propose a method for measuring EVA radiation doses on the International Space Station (ISS).
Main Methods:
- Review of space radiation environment and dose limits.
- Analysis of preliminary dosimetry experiments on the BION satellite series.
- Description of a proposed experiment for ISS implementation.
Main Results:
- Preliminary experiments indicate significant variability in EVA radiation doses.
- Factors influencing dose include EVA suit shielding, temporal fluctuations, and spacecraft orbit/shielding.
- Current dose limits for critical organs are discussed.
Conclusions:
- EVA radiation doses vary considerably and require accurate measurement.
- In-flight measurement of astronaut doses during EVA is recommended.
- A proposed experiment aims to implement these measurements on the ISS to mitigate radiation risks.