TY - JOUR AU - Denis Bergeron AU - Sean Collins AU - Leticia Pibida AU - Jeffrey Cessna AU - Ryan Fitzgerald AU - Brian Zimmerman AU - Peter Ivanov AU - John Keightley AU - Elisa Napoli C2 - Applied Radiation and Isotopes DA - 2020-12-31 DO - https://doi.org/10.1016/j.apradiso.2020.109572 LA - en M1 - 170 PB - Applied Radiation and Isotopes PY - 2020 TI - Ra-224 activity, half-life, and 241 keV gamma ray absolute emission intensity: a NIST-NPL bilateral comparison ER -