Activity standardisation of 45Ca and 204Tl using the new TDCR system at CMI
Jazyk angličtina Země Anglie, Velká Británie Médium print-electronic
Typ dokumentu časopisecké články
PubMed
22476016
DOI
10.1016/j.apradiso.2012.02.098
PII: S0969-8043(12)00146-7
Knihovny.cz E-zdroje
- MeSH
- analýza selhání vybavení MeSH
- dávka záření MeSH
- design vybavení MeSH
- internacionalita MeSH
- poločas MeSH
- radioizotopy thallia analýza normy MeSH
- radioizotopy vápníku analýza normy MeSH
- radiometrie přístrojové vybavení normy MeSH
- referenční hodnoty MeSH
- referenční standardy MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- radioizotopy thallia MeSH
- radioizotopy vápníku MeSH
A new triple-to-double coincidence ratio (TDCR) system has been established at CMI as an additional technique for primary activity standardisation. Details of the detectors and the electronics are given. Construction of the optical chamber was validated using measurement of a (3)H standard-the efficiency achieved with Ultima Gold was 58%. Several methods of efficiency variation (coloured bands painted on vial, positioning and photomultipliers defocussing) are compared. Activity concentrations of (204)Tl and (45)Ca were determined with the TDCR method and with the efficiency tracer technique. Advantages of the TDCR method compared to the efficiency tracing method and agreement between results are shown.
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