Abstract
Our instrumental analytical method for an ultra-sensitive determination of Ir and Se in sediments and volcanic emission products is based on epithermal neutron activation analysis (ENAA) coupled with multiparameter coincidence spectrometry. An adequate setting of the energy paths and of the multiparameter coincidence spectrometry. An adequate setting of the energy paths and of the multiparameter analyzer allows a simultaneous counting of75Se and192Ir coincidences. This tool has been used to analyse different sediments sampled at the Cretaceous-Tertiary boundary (KTB) and volcanic samples in order to discuss the extra-terrestrial or volcanic origin of the Ir anomaly.
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