Van Ammel R, Pommé S, Paepen J, Sibbens G. Measurement of the 109Cd half-life.
Appl Radiat Isot 2011;
69:785-9. [PMID:
21342765 DOI:
10.1016/j.apradiso.2011.01.020]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Revised: 11/22/2010] [Accepted: 01/14/2011] [Indexed: 11/29/2022]
Abstract
The half-life of (109)Cd was measured by following the decay of sources from a radiochemically pure solution with two different measuring systems: an ionisation chamber and a high-purity germanium (HPGe) detector. The measurements were performed over a period of 3.6 years, i.e. about 2.8 half-lives of (109)Cd. The resulting half-life values and detailed uncertainty budgets (k=1) are presented for both systems. The result obtained with the ionisation chamber, 462.36 (33) days, and the one obtained with the HPGe detector, 461.92 (76) days, are mutually consistent. The weighted mean of our measured values, T(1/2)((109)Cd)=462.29 (30) days, is consistent with the currently recommended values of 461.4 (12) days (Schönfeld and Dersch, 2004; IAEA, 2007) and 462.0 (3) days (Xiaolong et al., 2010). From a set of selected experimental values published after 1970, a "partially weighted mean" (Pommé and Spasova, 2008) of T(1/2)((109)Cd)=462.36 (39) days was calculated. More measurements are needed to resolve the discrepancies among literature data and to reduce the final uncertainty on the (109)Cd half-life.
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