Schematic Illustration of the Operation of MESSENGER's Gamma-Ray Spectrometer (GRS)
2,031 views · Published 13 May 2013 · 0:13 · Indexed 27 October 2026
Channel: NASA Video · 2013 · Science & Technology
Galactic cosmic rays interact with Mercury's surface to a depth of tens of centimeters, producing high-energy neutrons. These neutrons interact with surface material, resulting in the emission of gamma rays with energies characteristic of the emitting elements and low-energy neutrons. Naturally occurring elements such as potassium, thorium, and uranium also emit gamma rays. Detection of the gamma rays and neutrons by GRS allows determination of the chemical composition of the surface.
