Activity standard and calibrations for 227Th with ingrowing progeny

Bergeron, Denis E.; Cessna, Jeffrey T.; Broder, Brittany A.; Pibida, Leticia; Fitzgerald, Ryan P.; DiGiorgio, Morgan; Napoli, Elisa; Zimmerman, Brian E.

doi:10.1016/j.apradiso.2024.111326

Applied Radiation and Isotopes

2024

DOI: 10.1016/j.apradiso.2024.111326

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Activity standard and calibrations for 227Th with ingrowing progeny

Denis E. Bergeron,

Jeffrey T. Cessna,

Brittany A. Broder

et al.

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2024

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Calibration of an ionisation chamber for parent–progeny decay

Pommé

2024

Metrologia

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For a single radionuclide being measured in an ionisation chamber, a calibration factor can be established that relates the ionisation current to the source activity. The same applies to a decay chain in secular equilibrium, for which the calibration factor comprises the ionisation current produced by the parent and progeny nuclei combined. The calibration of an ionisation chamber for non-equilibrated parent-progeny decay poses a problem, since the activity ratio of parent and progeny nuclei varies with time. This paper examines cases in which the half-lives of the parent and only one of the progeny in the decay series are significantly long. Thus, two calibration factors are involved which combine differently as a function of time. By means of nuclear dating of the material, the parent-progeny activity ratio can be determined and the respective contributions to the ionisation current unambiguously distinguished. Once the ionisation chamber is calibrated, two measurements taken at different times are sufficient to determine the activity and age of a parent-progeny mixture. This study presents equations for calculating the calibration factors and propagating uncertainties, illustrated with a case study focussing on the 227Th-223Ra decay chain used in alpha-immunotherapy.

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Calibration of an ionisation chamber for parent–progeny decay

Pommé

2024

Metrologia

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Activity standard and calibrations for 227Th with ingrowing progeny

Cited by 1 publication

References 40 publications

Calibration of an ionisation chamber for parent–progeny decay

Calibration of an ionisation chamber for parent–progeny decay

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