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  • 1 Ecole Polytechnique Energy Engineering Institute Station A P.O. Box 6079 H3C 3A7 Montreal Quebec (Canada)
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A pseudocyclic activation system has been installed at the Ecole Polytechnique SLOWPOKE reactor. It is shown that, for analyses of geological material with short-lived nuclides, pseudocyclic activation is preferable to cyclic activation because it avoids the buildup of28Al activity. The total experiment time is reasonable when several sample are analyzed. The possibilities of the technique were illustrated with the analysis of nine well-known silicate rocks. With n cycles an improvement in precision approaching n1/2 was achieved. The detection limits in silicate rocks were determined for 18 elements using thermal and epithermal irradiation and 25 cycles.