Details

Autor(en) / Beteiligte

• Bergeron, Denis E.
• Cessna, Jeffrey T.
• Fitzgerald, Ryan P.
• Laureano-Pérez, Lizbeth
• Pibida, Leticia
• Zimmerman, Brian E.

Titel

Primary standardization of 212Pb activity by liquid scintillation counting

Ist Teil von

• Applied radiation and isotopes, 2022-12, Vol.190, p.110473-110473, Article 110473

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2022

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• 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. •A solution of 212Pb in equilibrium with its progeny was standardized for activity•Triple-to-double coincidence ratio (TDCR) liquid scintillation counting was used•Efficiency tracing and anticoincidence provided confirmatory measurements•Settings for radionuclide calibrators are discussed•Earlier recommended radionuclide calibrator settings did not account for all progeny