TY - JOUR AU - Fenwick, Andrew AU - Bergeron, Denis AU - Broder, Brittany AU - Bendall, Emma AU - Cessna, Jeffrey AU - Collins, Sean AU - Pibida, Leticia AU - Ramirez, Natasha AU - Napoli, Elisa C2 - Metrologia DA - 2025-02-03 05:02:00 DO - https://doi.org/10.1088/1681-7575/adac65 LA - en M1 - 62 PB - Metrologia PY - 2025 TI - A bilateral comparison of 227Th activity standards between NPL and NIST UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958444 ER -