MSL-RAD radiation environment measurements

Area of Science:

• Space Science
• Astrobiology
• Radiation Physics

Background:

• Understanding the space radiation environment is crucial for human space exploration.
• Galactic Cosmic Rays (GCRs) and Solar Energetic Particles (SEPs) pose significant health risks.
• Previous radiation measurements have been limited, especially from planetary surfaces.

Purpose of the Study:

• To present radiation measurements from the Radiation Assessment Detector (RAD) on Mars.
• To estimate radiation exposure for a human crew traveling to and from Mars.
• To provide the first detailed radiation data from the Martian surface for future mission planning.

Main Methods:

• Utilized the Radiation Assessment Detector (RAD) on the Mars Science Laboratory (MSL) spacecraft.
• Collected data during the interplanetary cruise phase and on the Martian surface.
• Measured energetic particles (GCRs, SEPs) and secondary particles, calculating dose and dose equivalent.

Main Results:

• Radiation dose and dose equivalent were dominated by continuous GCRs.
• Several Solar Energetic Particle (SEP) events were detected during the mission.
• Surface measurements provide crucial data on radiation shielding by the Martian atmosphere and regolith.

Conclusions:

• RAD data offers valuable insights into the space radiation environment relevant to human health.
• Martian surface radiation levels are influenced by GCRs and atmospheric shielding.
• These findings are essential for designing radiation protection strategies for future crewed missions to Mars.