General Description :
These files contain absolute thorium abundances (in units of
micrograms per gram) binned into equal area pixels that have
a size of 2x2 degrees at the lunar equator. These abundances
are derived using a preliminary analysis of the GRS data.
The abundance uncertainties only represent the measured
standard deviation of the data for each pixel. As described
by Lawrence et al., GRL, 1999 and Lawrence et al., JGR, 2000, these
data may have systematic uncertainties of up to 20% that are not accounted
for with the measured uncertainties. Questions about these data should
be directed to David Lawrence at djlawrence@lanl.gov.
Initial thorium abundances from the low-altitude portion of
the LP mission (defined as Release 1) were published by
Lawrence et al., Geophys. Res. Lett., 26, 2681, 1999
(manuscript+figures).
Release 2 contains both high- and low-altitude abundances as described by
Lawrence et al., J. Geophys. Res.,, 105, #E8, 20307, 2000.
(manuscript,
manuscript+figures[7.8MB]).
Note: The Release 2 low-altitude data are approximately 25%
higher than the Release 1 data because the gamma-ray flux per unit abundance
thorium was incorrectly derived in the GRL paper. For further details, please
see the appendix of Lawrence et al., 2000.
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Data
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Absolute Thorium Abundances
The thorium data are binned into 11,306 equal-area pixels which have
a size of 2x2 degrees at the lunar equator. The data are given in
ASCII text format. The "low" dataset includes data from
the entire low-altitude portion of the LP mission. The "high" dataset
combines data from both the high1 and high2 portions of the LP mission.
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