Lunar Exploration Neutron Detector (LEND) for NASA Lunar Reconnaissance Orbiter

Details Lunar Exploration Neutron Detector (LEND) for NASA Lunar Reconnaissance Orbiter Lunar Exploration Neutron Detector (LEND) for NASA Lunar Reconnaissance Orbiter

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p51d1234m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P51D-1234

Other

5420 Impact Phenomena, Cratering (6022, 8136), 5494 Instruments And Techniques

Scientific paper

The Russian-made instrument LEND (Lunar Exploration Neutron Detector) is young brother of another Russian instrument HEND (High Energy Neutron Detector), which continues to perform well in its fifth year of science measurements onboard NASA Mars Odyssey. LEND and HEND have similar types of neutron sensors, and valuable science data from HEND about Martian water resources has proved adequate selection of these sensors for purposes of orbital neutron spectroscopy of the planet. The Lunar Exploration Neutron Detector (LEND) has been selected for NASA Lunar Reconnaissance Orbiter (LRO) mission to provide the global search of hydrogen distribution through 1-2 meters of lunar subsurface from 50 km circular polar orbit of LRO. The most important property of LEND is its capability to provide high spatial resolution mapping of epithermal neutrons with collimated neutron detectors. LEND is able to detect hydrogen-rich spot at a pole with about 100 ppm of hydrogen with spatial resolution of 5 km (Half Width Half Maximum) and to produce global mapping of hydrogen content with resolution of 5-20 km. If hydrogen is associated with water, detection limit of 100 ppm of hydrogen corresponds to ~ 0.1 wt% of water in the regolith. Neutron radiation from the regolith could have as large an impact on astronaut safety as energetic charged particles from Galactic Comic Rays and Solar Particle Events. LEND will have a full set of sensors for thermal, epithermal and high energy neutrons to provide data for neutron component of radiation environment in the broad range of more than 9 decades of energy.

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