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...tor]] was designed to detect these events by tracking the [[alpha particle|alpha particles]] emitted during the decay of [[radon|radon 222]] and [[polonium| ....nasa.gov/results/alres.htm NASA Lunar Prospector Project - Alpha Particle Spectrometer Results]

...trating radar, an alpha particle x-ray spectrometer and a visible/infrared spectrometer. The lander and rover took pictures of each other and used their scientifi