Primary standardization of 212Pb activity by liquid scintillation counting
Denis E. Bergeron, Jeffrey T. Cessna, Ryan P. Fitzgerald, Lizbeth Laureano-Perez, Leticia Pibida, Brian E. Zimmerman
An activity standard for 212Pb in equilibrium with its progeny was realized, based on triple-to-double coincidence ratio (TDCR) liquid scintillation (LS) counting. A Monte Carlo-based approach to estimating uncertainties due to nuclear decay data (branching ratios, beta endpoint energies, γ-ray energies, and conversion coefficients for 212Pb and 208Tl) led to combined standard uncertainties ≤ 0.20 %. Confirmatory primary measurements were made by LS efficiency tracing with tritium and 4παβ(LS)-γ(NaI(Tl)) anticoincidence counting. The standard is discussed in relation to current approaches to 212Pb activity calibration. In particular, potential biases encountered when using inappropriate radionuclide calibrator settings are discussed.
, Cessna, J.
, Fitzgerald, R.
, Laureano-Perez, L.
, Pibida, L.
and Zimmerman, B.
Primary standardization of 212Pb activity by liquid scintillation counting, Applied Radiation and Isotopes, [online], https://doi.org/10.1016/j.apradiso.2022.110473, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934868
(Accessed February 1, 2023)