1.
Appl Radiat Isot
; 70(9): 2200-3, 2012 Sep.
Artigo
em Inglês
| MEDLINE
| ID: mdl-22476016
RESUMO
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.
Assuntos
Radioisótopos de Cálcio/análise , Radioisótopos de Cálcio/normas , Radiometria/instrumentação , Radiometria/normas , Radioisótopos de Tálio/análise , Radioisótopos de Tálio/normas , Desenho de Equipamento , Análise de Falha de Equipamento , Meia-Vida , Internacionalidade , Doses de Radiação , Padrões de Referência , Valores de Referência
2.
Calcif Tissue Int
; 48(5): 370-1, 1991 May.
Artigo
em Inglês
| MEDLINE
| ID: mdl-2054721
3.
J Bone Miner Res
; 6(1): 99, 1991 Jan.
Artigo
em Inglês
| MEDLINE
| ID: mdl-2048438