TY - GEN AU - Ronald Colle AU - Lizbeth Laureano-Perez AU - Svetlana Nour AU - Jerome LaRosa AU - Brian Zimmerman AU - Leticia Pibida AU - Denis Bergeron C2 - Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD DA - 2017-12-27 DO - https://doi.org/10.6028/jres.122.044 LA - en M1 - 122 PB - Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD PY - 2017 TI - Natural Uranium Radioactivity Solution Standard: SRM 4321d ER -