Other
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997isr2.meet....7d&link_type=abstract
In Situ Resource Utilization (ISRU II) Technical Interchange Meeting, p. 7
Other
Neutron Counters, Lithium Isotopes, Alpha Particles, Moisture Content, Planetary Surfaces, Neutron Spectra, Silicon, Wafers, Helium Isotopes, Kinetic Energy, Semiconductor Devices
Scientific paper
The neutron counter proposed here has a long history and was commercially available in a somewhat different form. This counter would be suitable for a rover or lander since it requires a rather long measuring time for each placement. It consists of two silicon wafer charged-particle counters with a layer of Li-6F deposited on the inner surface of one. The neutron detecting reaction is Li-6(n,H-3)He-4 in which the alpha particle and the triton are emitted from the Li-6 deposit back to back. If one of the detectors sees the alpha particle, the other will see the triton. This allows one to use a coincidence technique that virtually eliminates all background. The signals from each detector can be added together so that the total energy of the reaction, Q=4.6 MeV and the kinetic energy of the neutron, can be recorded.
Clark Benton C.
Drake Darrell M.
Jakosky Bruce M.
Reedy Robert
Squyres Steven W.
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