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Published on: January 6, 2016
Activity standardization by liquid scintillation counting and half-life measurements of 90Y
1Department 6.1, Physikalisch-Technische Bundesanstalt, Bundesallee 100, Braunschweig D-38116, Germany. Karsten.Kossert@ptb.de
Abstract:
Radioactive 90Y was standardized by means of 4piBeta liquid scintillation efficiency tracing with a two-phototube counting system. The efficiencies of 90Y and the tracer 3H are related by the CIEMAT/NIST method. The dependence of the calculated efficiency on various shape factors and the importance of accurately measuring the radionuclide impurity of 90Sr are discussed. The half-life of 90Y was measured with improved accuracy by means of a liquid scintillation counting and a 4pi ionization chamber measuring system, and an average value T1/2 = 64.053(20) h was found.
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