File:PIA16917-MarsCuriosityRover-DAN-2of2.jpg
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DescriptionPIA16917-MarsCuriosityRover-DAN-2of2.jpg |
English: Physics of How DAN on Curiosity Checks for Water, Part 2 This diagram and the one at PIA16916 illustrate how the Dynamic Albedo of Neutrons (DAN) instrument on NASA's Curiosity Mars rover detects hydrogen in the ground beneath the rover. Detected hydrogen is interpreted as hydroxyl groups or water molecules, such as those bound into the structure of hydrated minerals. DAN shoots neutrons into the ground and measures the timing and energy levels of neutrons reflected back up. This diagram depicts the case of a neutron that collides with hydrogen atoms before it reaches DAN's detector. Collisions with hydrogen nuclei -- of similar mass to the neutron itself, like two billiard balls -- result in a change in energy level and a change in the time interval between when the neutron is emitted by DAN's neutron generator and when it reaches DAN's detector, compared with neutrons that do not collide with hydrogen, as in the companion diagram. |
Date | |
Source | http://photojournal.jpl.nasa.gov/catalog/PIA16917 |
Author | NASA/JPL-Caltech/Russian Space Research Institute |
This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA16917. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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