High-precision measurement of the half-life of 147Sm.
The half-life of the long-lived isotope (147)Sm was determined by means of activity determination using liquid scintillation counting. The amount of samarium was determined by ICP-OES using a NIST reference standard. The isotopic ratio N((147)Sm)/N(Sm) of the samples was measured by means of ICP-HRMS. The half-life was found to be 1.070(9)x10(11) y. The result is in good agreement with other evaluations and the relative standard uncertainty of 0.8% is lower than in any previous work.
Kossert
Karsten
K
Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany. karsten.kossert@ptb.de
Jörg
Gerhard
G
Nähle
Ole
O
v Gostomski
Christoph Lierse
CL