Abstract
The Triple to Double Coincidence Ratio (TDCR) method requires a special counting system with three photodetectors. The systems currently used by National Metrology Institutes for activity standardizations are custom built, and up to now the HIDEX 300 SL counter11Manufactured by HIDEX Oy, Finland.,22Certain commercial equipment, instruments, or materials are identified in this paper to foster understanding. Such identification does not imply recommendation by the Physikalisch-Technische Bundesanstalt, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose. is the only TDCR counter commercially available.At PTB, measurements with a special metrology version of this counter were carried out to investigate its applicability for activity standardizations. The activity results of measurements with the HIDEX counter are compared to those obtained with a PTB–TDCR counter, as such a comparison reduces the model dependence. In addition, a spectrometry method was applied to measure 109Cd samples and a new TDCR-Čerenkov method was tested with 32P samples.
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