Gamma Ray and Neutron Detector (GRaND) Instrument
Click on the yellow hotspots and roll over the blue and green hotspots to explore how the GRaND instrument works.

The Gamma Ray and Neutron Detector (GRaND) instrument interactive illustrates how scientists learn about the composition of an asteroid by studying energy and neutrons that emanate from it. The Dawn spacecraft contains three instruments (GRaND, Visible Infrared Spectrometer, and the Framing Camera) that will provide new answers to questions about the formation and evolution of the early solar system.
+ Dawn Dictionary
+ Listen to GRaND Principal Investigator,Tom Prettyman, explain the diagram above (MP3 3.4 Mb; Run time: 6 min.)
+ Download latest version of QuickTime Player
+ Download latest version of Flash Player
+ Read article written by Tom Prettyman—This article was published in the Encyclopedia of the Solar System (Second Edition), Lucy-Ann McFadden, Paul R. Weissman and Torrence V. Johnson, Remote Chemical Sensing Using Nuclear Spectroscopy, Pages 765-786, copyright © Elsevier Inc. 2007.