Astronaut Bones: Stable Calcium Isotopes in Urine as a Biomarker of Bone Mineral Balance

Gwyneth Williams Gordon, Arizona State University, METAL Lab, Tempe, AZ, United States, Stephen J Romaniello, Arizona State University, School of Earth and Space Exploration, Tempe, AZ, United States, Joseph Skulan, Elemental Biomarkers, LLC, Vernon, WI, United States, Ariel D Anbar, Arizona State University, School of Earth and Space Exploration and School of Molecular Sciences, Tempe, AZ, United States; Arizona State University, School of Earth & Space Exploration and School of Molecular Sciences, Tempe, AZ, United States, Scott M Smith, NASA Johnson Space Center, Biomedical Research and Environmental Sciences Division, Houston, TX, United States and Sara Zwart, NASA Johnson Space Center, Universities Space Research Association, Houston, TX, United States