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Proceedings Paper

Development of the LunaH-Map miniature neutron spectrometer
Author(s): Erik B. Johnson; Craig Hardgrove; Richard Starr; Sam Vogel; Rebecca Frank; Graham Stoddard; Stephen West; James Christian
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Paper Abstract

There is strong evidence that water-ice is relatively abundant within permanently shadowed lunar surface materials, particularly at the poles. Evidence for water-ice has been observed within the impact plume of the LCROSS mission and is supported by data gathered from the Lunar Exploration Neutron Detector (LEND) and the Lunar Prospector Neutron Spectrometer (LPNS). Albedo neutrons from the Moon are used for detection of hydrogen, where the epi-thermal neutron flux decreases as hydrogen content increases. The origin on the concentration of water within permanently shadowed regions is not completely understood, and the Lunar Polar Hydrogen Mapper (LunaH-Map) mission is designed to provide a high-resolution spatial distribution of the hydrogen content over the southern pole using a highly elliptical, low perilune orbit. The LunaH-Map spacecraft is a 6U cubesat consisting of the Miniature Neutron Spectrometer (Mini-NS). Mini-NS is not collimated, requiring a low altitude to achieve a higher spatial resolution compared to previous missions. To develop a compact neutron detector for epi-thermal neutrons, the Mini-NS comprises of 2-cm thick slabs of CLYC (Cs2LiYCl6), which provide a sensitivity similar to a 10-atm, 5.7-cm diameter He-3 tubes, as used in LPNS. The Mini-NS digital processing electronics can discriminate by shape and height to determine signal (albedo neutrons) from background (cosmic rays). The Mini-NS achieves a total active sensing area of 200 cm2 and is covered with a cadmium sheet to shield against thermal neutrons. The research and development on the detector modules show a robust design ready for space flight.

Paper Details

Date Published: 24 August 2017
PDF: 10 pages
Proc. SPIE 10392, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX, 103920H (24 August 2017); doi: 10.1117/12.2276273
Show Author Affiliations
Erik B. Johnson, Radiation Monitoring Devices, Inc. (United States)
Craig Hardgrove, Arizona State Univ. (United States)
Richard Starr, Catholic Univ. of America (United States)
Sam Vogel, Radiation Monitoring Devices, Inc. (United States)
Rebecca Frank, Radiation Monitoring Devices, Inc. (United States)
Graham Stoddard, Radiation Monitoring Devices, Inc. (United States)
Stephen West, Univ. of Arizona (United States)
James Christian, Radiation Monitoring Devices, Inc. (United States)

Published in SPIE Proceedings Vol. 10392:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX
Arnold Burger; Ralph B. James; Michael Fiederle; Larry Franks; Stephen A. Payne, Editor(s)

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