Measurement of the 225Ac half-life

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
S PomméAlfred Morgenstern

Abstract

The (225)Ac half-life was determined by measuring the activity of (225)Ac sources as a function of time, using various detection techniques: α-particle counting with a planar silicon detector at a defined small solid angle and in a nearly-2π geometry, 4πα+β counting with a windowless CsI sandwich spectrometer and with a pressurised proportional counter, gamma-ray spectrometry with a HPGe detector and with a NaI(Tl) well detector. Depending on the technique, the decay was followed for 59-141 d, which is about 6-14 times the (225)Ac half-life. The six measurement results were in good mutual agreement and their mean value is T(1/2)((225)Ac)=9.920 (3)d. This half-life value is more precise and better documented than the currently recommended value of 10.0 d, based on two old measurements lacking uncertainty evaluations.

References

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Mar 27, 2007·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Huang Xiaolong, Wang Baosong
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Apr 3, 2012·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·S PomméAlfred Morgenstern

Citations

Feb 19, 2013·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·M MarouliAlfred Morgenstern
Mar 21, 2013·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·G SulimanAlfred Morgenstern
Jan 1, 2014·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·G WangAntonia G Denkova
May 13, 2014·Immunotherapy·Christof Seidl
Feb 26, 2014·Biochimica Et Biophysica Acta·Pinakin SukthankarJ M Tomich
Jun 13, 2015·Pharmaceuticals·Robin M de KruijffAntonia G Denkova
Apr 14, 2016·Seminars in Nuclear Medicine·Dominik CordierAdrian Merlo
Jun 12, 2018·Cancer Biotherapy & Radiopharmaceuticals·Nikki A Thiele, Justin J Wilson
Oct 4, 2017·Current Medicinal Chemistry·Mateusz KowalikBarbara Barszcz
Mar 29, 2020·Journal of Labelled Compounds & Radiopharmaceuticals·Pallab Datta, Soumendranath Ray

Related Concepts

Actinium
Alpha Radiation
Half-Life
Gray Units
Radioactivity
Silicon
Spectrometry, Gamma
Mass Spectrometers (Device)
Angular
Evaluation

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