Abstract
With the first version of the IDC[*] software all known radionuclides, less the natural ones and one “naturalised” man-made one, caused a spectrum measured in the IMS* network to be characterised as interesting from a CTBT* point of view. But this is really not true for the majority of nuclides, so a change has been made to let only nuclides from a limited set of so called CTBT relevant nuclides have an impact on the characterization scheme. In the present paper the concept of CTBT relevance is analysed and a set of 96 relevant nuclides are defined. Out of these 51 are fission products and 41 are neutron activation products. There are also 4 nuclides which are residues from the nuclear fuel itself or added tracers.

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