conventionally dated age of the Earth. We consider the major radionuclides to be Uranium-235, Uranium-238, Thorium-232 and Potassium-40 with principal decay modes known to be Alpha for the heavy isotopes and Beta for potassium. In the absence of data to the contrary, the relative abundances of these isotopes have been assumed to be the same as those on Earth, with data on Uranium being available for the bulk Moon (2) and Thorium concentration data for its surface (12,13). It is also assumed that the current crust/mantle ratios for the Moon and Earth are the same. These can be combined to give the bulk result shown in Cell F29 and found to be between that of Earth and the revised estimate from Drake et al (2). References for input data are highlighted in yellow, with cited sources in the References table. If data is taken from another cell in the same sheet, the cell reference is shown, highlighted in cyan. If it is from another sheet, the sheet number appears before the cell reference. Key result fields are highlighted to the right in magenta. References Sheet 2 Explanatory Notes — Gravitational Energy No. Source 1 https://en.wikipedia.org/wiki/Moon 2 Drake M J, Lowe J P, Righter K, Zuber M T & Clark P E, Uranium in the Lunar Crust: Implications for Lunar Origin and Evolution, Proc. 61st Annual Meteoritical Society Meeting, 5174.pdf (1998) 3 https://en.wikipedia.org/wiki/Internal_structure_of_the_ Moon 4 https://en.wikipedia.org/wiki/Anorthite 5 https://en.wikipedia.org/wiki/Iron 6 https://en.wikipedia.org/wiki/Uranium-235#Natural_decay_chain 7 https://arxiv.org/abs/hep-ph/0409152v1 8 https://en.wikipedia.org/wiki/Electron 9 https://en.wikipedia.org/wiki/Avogadro_constant 10 https://en.wikipedia.org/wiki/Abundances_of_the_elements_(data_page) 11 https://en.wikipedia.org/wiki/Potassium-40 12 https://en.wikipedia.org/wiki/KREEP#/media/File:Lunar_ Thorium_concentrations.jpg 13 Metzger A E, Haines E L, Parker R E & Radocinski R G, Thorium Concentrations in the Lunar Crust: Part 1 - Regional Values and Crustal Content, Proc. 8th Lunar Scientific Conference, 949-999 (1977) 14 https://en.wikipedia.org/wiki/Age_of_the_Earth STERNBERG Craters and cracks 2023 ICC 28
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