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Standardisation and precise determination of the half-life of (44)Sc
E García-Toraño1, V Peyrés1, M Roteta1
1Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Avda. Complutense 40, Madrid 28040, Spain.
Abstract:
The half-life of the positron-emitter (44)Sc has been determined by following the decay rate with two measurement systems; an Ionisation Chamber and a HPGe detector. The combination of seven results gives a value of T1/2=4.042 (25)h, about 2% higher than the recommended value of T1/2=3.97 (4)h (Browne, 2011) and with a lower uncertainty. This radionuclide has also been standardised by coincidence counting, and liquid scintillation counting techniques. A (44)Ti/(44)Sc generator developed at CIEMAT was used to obtain the (44)Sc solutions used in all measurements.
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