Abstract
The SELENE-2, a lunar landing mission to clarify the lunar origin and evolution, has been studied in Japan Aerospace Exploration Agency (JAXA). And our group proposes to develop Science Instrument Package (SIP), it can conduct detailed analyses of the lunar rock samples collected by the rover with an X-ray spectrometer/diffractometer, a multi-band microscope. The SIP also controls the sample surface condition with grinding and brushing, avoiding it from contamination by surface bearing dusts and weathering processes. This study bring out the influence on analytical precision by contamination on the sample surface with an X-ray spectrometer.