Measurement of 49V half-life

The accepted value for the 49V half-life is either 330+/-15 days, based on a few old measurements with large dispersion, or 338+/-5 days, from a more recent measurement. Methods of study have included proportional counting and Nal X-ray detection. A new direct measurement of the 49V half-life has been carried out for over 2.5 half lives using liquid scintillation counting, as an additional contribution due to the scarce measurements of this radionuclide. A half-life value of 328.6+/-3.3 days was determined on the basis of an overall uncertainty analysis of 0.99%.