urn:nasa:pds:a16xrfs_surface_xray_counts:document:a16_psr_ch19_xrfs 1.0 1.24.0.0 Product_Document 2025 This document is Chapter 19, X-Ray Fluorescence Experiment, of the Apollo 16 Preliminary Science Report, NASA SP-315, published by NASA, Washington, D.C., 1972. The full report was downloaded from the publicly-available website for the NASA Apollo Lunar Surface Journal, http://history.nasa.gov/alsj/main.html. It can also be found on the publicly-available NASA Technical Reports Server, http://ntrs.nasa.gov/search.jsp which states the document is unclassified and does not have a copyright. 2025-09-19 1.0 Creation. Converted reprinted PDF to PDF/A format. 1972-12-01 This report presents the preliminary results from the analysis of Apollo 16 X-ray fluorescence data as of this publication. This document is in the public domain. PDF/A version English 1 a16_psr_ch19_xrfs.pdf PDF/A