Standardisation and precise determination of the half-life of (44)Sc

E García-Toraño; V Peyrés; M Roteta; A I Sánchez-Cabezudo; E Romero; A Martínez Ortega

doi:10.1016/j.apradiso.2015.12.007

Standardisation and precise determination of the half-life of (44)Sc

Appl Radiat Isot. 2016 Mar:109:314-318. doi: 10.1016/j.apradiso.2015.12.007. Epub 2015 Dec 5.

Authors

E García-Toraño¹, V Peyrés², M Roteta², A I Sánchez-Cabezudo², E Romero³, A Martínez Ortega³

Affiliations

¹ Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Avda. Complutense 40, Madrid 28040, Spain. Electronic address: [email protected].
² Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Avda. Complutense 40, Madrid 28040, Spain.
³ Unidad de Aplicaciones Biomédicas y Farmacocinética, CIEMAT, Avda. Complutense 40, Madrid 28040, Spain.

PMID: 26701659
DOI: 10.1016/j.apradiso.2015.12.007

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.

Keywords: Half-life; Positron emitters; Sc-44; Standardisation.

MeSH terms

Calibration / standards
Equipment Design
Equipment Failure Analysis
Half-Life*
Radiation Dosage
Radiation Dosimeters / standards*
Radioisotopes / analysis*
Radioisotopes / standards*
Reference Standards
Reproducibility of Results
Scandium / analysis*
Scandium / standards*
Sensitivity and Specificity
Spain

Substances

Radioisotopes
Scandium