Search for Water Ice Deposits

	Neutron Lethargy vs H²O Content. Simulated neutron lethargy energy spectra for a ferroan-anorthosite regolith containing various weight percent admixtures of H²O. From top to bottom, the spectra correspond to mass fractions of H²O of 0%, 0.01%, 0.1%, 1%, 3%, 10%, 30%, and 100%, respectively. Feldman et al., Science, 281, 1496, 1998.
	Neutron Counting Rates vs H²O Content. Simulated Epithermal and Fast neutron counting rates as a function of mass fraction of H²O added to a FAN regolith. Feldman et al., Science, 281, 1496, 1998.
	Neutron Counting Rates for Buried H²O. Simulated epithermal and fast neutron counting rates for a dessicated FAN layer of varying thickness that overlays a thick, circular deposit of water ice having a radius of 24.3 km, which is surrounded by a dessicated FAN regolith. Feldman et al., Science, 281, 1496, 1998.
	Histograms of the Neutron Family. Histograms of counts per areal pixel of thermal, epithermal and fast-neutron counting rates. The histogram labeled epithermal* is constructed by subtracting 6.8% of the thermal histogram from the epithermal histogram. Feldman et al., Science, 281, 1496, 1998.
	Epithermal Counting Rate Map. A full-Moon map of the epithermal* counting rates. Both globes are tilted by 45° in latitude with the near side and north pole at the left and the far side and south pole at the right. The scale given at the top corresponds the the counts registered by the Cd-covered ³He gas proportion counter in 32 sec. Feldman et al., Science, 281, 1496, 1998.
	Signature of Water Deposits at the Poles in the Epithermals Neutrons? Averages and the standard deviations of all the epithermal* counts for all equal-area pixels within successive 2° wide latitude bins that are bounded in azimuthal angle by planes that are parallel to the lunar polar axis and separated by 2° in longitude at the equator. Feldman et al., Science, 281, 1496, 1998.
	Signature of Water Deposits at the Poles in the Fast Neutrons? Averages and the standard deviations of all the fast-neutron counts for all equal-area pixels within successive 2° wide latitude bins that are bounded in azimuthal angle by planes that are parallel to the lunar polar axis and separated by 2° in longitude at the equator. Feldman et al., Science, 281, 1496, 1998.
	Lunar prospector evidence for water ice at the north (left) and south (right) lunar poles. Data on the rate of epithermal neutron emission from the lunar surface are color coded on the two maps (overlaid by surface relief map) poleward of +- 70°. The dark blue and purple areas indicate low counting rates and are consistent with hydrogen-rich deposits covered by dessicated regolith. Feldman et al., Science, 281, 1496, 1998.
	Lunar prospector evidence for water ice at the north (top) and south (bottom) lunar poles using low altitude data. Feldman et al., New Views of the Moon, 1999