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Bergeron, D E; Collins, S M; Pibida, L; Cessna, J T; Fitzgerald, R; Zimmerman, B E; Ivanov, P; Keightley, J D; Napoli, E (2021) Ra-224 activity, half-life, and 241 keV gamma ray absolute emission intensity: A NIST-NPL bilateral comparison. Applied Radiation and Isotopes, 170. 109572 ISSN 09698043

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Michotte, C; Nonis, M; Bergeron, D; Cessna, J; Fitzgerald, R; Pibida, L; Zimmerman, B; Fenwick, A; Ferreira, K; Keightley, J D; Silva, I Da (2017) Activity measurements of the radionuclides 18F and 64Cu for the NIST, USA in the ongoing comparisons BIPM.RI(II)-K4.F-18 and BIPM.RI(II)-K4.Cu-64. Metrologia, 54 (1A). 06011 ISSN 0026-1394