Absolute emission intensities of the gamma rays from the decay of 224Ra and 212Pb progenies and the half-life of the 212 Pb decay

L Pibida; D E Bergeron; S M Collins; P Ivanov; J T Cessna; R P Fitzgerald; J Mewburn-Crook; B E Zimmerman; L King

doi:10.1016/j.apradiso.2023.111171

Absolute emission intensities of the gamma rays from the decay of ²²⁴Ra and ²¹²Pb progenies and the half-life of the ²¹² Pb decay

Appl Radiat Isot. 2024 Mar:205:111171. doi: 10.1016/j.apradiso.2023.111171. Epub 2024 Jan 3.

Authors

L Pibida¹, D E Bergeron², S M Collins³, P Ivanov⁴, J T Cessna⁵, R P Fitzgerald⁶, J Mewburn-Crook⁷, B E Zimmerman⁸, L King⁹

Affiliations

¹ National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA. Electronic address: leticia.pibida@nist.gov.
² National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA. Electronic address: denis.bergeron@nist.gov.
³ National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK; School of Mathematics and Physics, University of Surrey, Guildford, GU2 7XH, UK. Electronic address: sean.collins@npl.co.uk.
⁴ National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK. Electronic address: ivanov@npl.co.uk.
⁵ National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA. Electronic address: jeffrey.cessna@nist.gov.
⁶ National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA. Electronic address: ryan.fitzgerald@nist.gov.
⁷ National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK. Electronic address: Mewburn.Crook@npl.co.uk.
⁸ National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA. Electronic address: brian.zimmerman@nist.gov.
⁹ National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA. Electronic address: lynne.king@nist.gov.

PMID: 38181577
DOI: 10.1016/j.apradiso.2023.111171

Abstract

Absolute gamma-ray emission intensities for 36 characteristic gamma rays from the decay of ²²⁴Ra, ²¹²Pb, and their progeny were determined by measuring sources calibrated for activity by means of primary methods based on well-defined high-purity germanium (HPGe) detectors at both NIST and NPL. Results from the two laboratories agree with recent data evaluations, except for gamma rays with low emission intensities. The decay schemes have been re-balanced based on the new results. In addition, the half-life for ²¹²Pb was measured using several HPGe detectors, ionization chambers, and a well-type NaI(Tl) detector.

Keywords: (212)Pb; (224)Ra progeny; Emission probabilities; Gamma-ray spectrometry; Half-life; Photon emission intensity.

Published by Elsevier Ltd.