The unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
Curiosity has been monitoring radiation during its stay on Mars with its RadiationAssessmentDetector (RAD).
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The RadiationAssessmentDetector (RAD) aboard the Mars Science Laboratory rover, also known as Curiosity, has been operating on Mars since 2012.
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During cruise the RadiationAssessmentDetector (RAD), situated on board the Curiosity rover, conducted measurements of the energetic-particle radiation environment inside the spacecraft.