Abstract:<p>Fine Resolution Epithermal Neutron Detector, FREND, is an instrument onboard ExoMars&#8217; Trace Gas Orbiter (TGO). It uses neutron measurements to detect hydrogen (and thus water) variations in the shallow subsurface of the Martian soil. Similar experiments have been performed in the past on Mars, but FREND&#8217;s main characteristic is its neutron collimator that significantly narrows down the field of view (FOV) to 28&#176; full cone which corresponds to a 60-200 k… Show more
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