Abstract
Radioactive decay half-life measurements of 223Ra, a member of the 235U naturally occurring radioactive decay series, have been performed of a radiochemically pure solution with an ionisation chamber. The radioactive decay of 223Ra was followed for 50 days, approximately 4.4 half-lives. The deduced half-life of 223Ra was found to be 11.4358 (28) days, supporting the other published direct measurements. A detailed uncertainty budget is presented. A new evaluation of the published half-life values was performed, indicating significant variation across the existing published values, suggesting that further measurements of the half-life of 223Ra are required. A new evaluated half-life has been calculated using a power moderated weighted mean of selected experimental values, with a new value of the recommended half-life for 223Ra of 11.4354 (17) days.
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