This page, from the Lunar and Planetary Institute, describes how the composition of portions of the lunar surface was determined by observing the fluorescence produced by solar x-rays. Images are provided with results from the experiments and links are offered to other LPI pages with information on the Apollo missions. This page is written at the level of introductory physics.
<a href="http://www.compadre.org/informal/items/detail.cfm?ID=8389">Lunar and Planetary Institute. Apollo 16 Experiments - Fluorescence Spectrometer. Houston: Lunar and Planetary Institute, October 29, 2007.</a>
Apollo 16 Experiments - Fluorescence Spectrometer. (2007, October 29). Retrieved December 1, 2015, from Lunar and Planetary Institute: http://www.lpi.usra.edu/lunar/missions/apollo/apollo_16/experiments/x_ray/
Lunar and Planetary Institute. Apollo 16 Experiments - Fluorescence Spectrometer. Houston: Lunar and Planetary Institute, October 29, 2007. http://www.lpi.usra.edu/lunar/missions/apollo/apollo_16/experiments/x_ray/ (accessed 1 December 2015).
%0 Electronic Source %D October 29, 2007 %T Apollo 16 Experiments - Fluorescence Spectrometer %I Lunar and Planetary Institute %V 2015 %N 1 December 2015 %8 October 29, 2007 %9 text/html %U http://www.lpi.usra.edu/lunar/missions/apollo/apollo_16/experiments/x_ray/
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