Author: S. Ismail 1
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  • 1 Atominstitut Schüttelstrasse 115 A-1020 Vienna Austria
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The fast transfer system was modified to enable a fixed counting geometry with high reproductibility using an endcap geometry. The optimal count rate for short time activation analysis by means of the loss free counting system was found to be within 100–140 kcts/s, if a high accuracy is needed (1%). The method of calculating the peak area after the dead time and pile up corrections was modified by changing the peak fitting parameters gradually with increasing count rates. Epithermal activation by a6LiD converter was found to be an ideal irradiation technique for short time activation analysis especially for heavy elements due to the lower contribution of24Na and28Al (up to 30 fold).