  This paper reviews improved calibration methods for the Lunar Reconnaissance
Orbiter Lunar Exploration Neutron Detector. We cross calibrated the set of LEND
observations and models of its detectors physical geometry and composition
against the McKinney Apollo 17 era measured neutron flux, Lunar Prospector
Neutron Spectrometer epithermal neutron observations, Earth based Galactic
Cosmic Ray observations and altitude dependent models of the Moon neutron
emission flux. Our neutron transport modeling of the LEND system with the
Geant4 software package allows us to fully decompose the varying contributions
of lunar, spacecraft and instrument dependent sources of neutrons and charged
particles during the LEND mission. With this improved calibration, we can now
fully predict every observation from the eight helium 3 detectors and the
expected total and partial count rates of neutrons and charged particles for
the entirety of LEND now ten plus year observation campaign at the Moon. The
study has resulted in an improved calibration for all detectors. The high
spatial resolution of LEND collimated and uncollimated sensors are illustrated
using the neutron suppression region associated with the south polar Cabeus
permanent shadowed region.
