NEW RECORDS ON LOW ACTIVITY MEASUREMENTS WITH NEUTRON-ACTIVATION ANALYSIS

A very sensitive NAA technique of Liquid organic scintillators has bee n developed at the Technische Universitat Munchen focusing on quasista ble radionuclides. Combining important input factors for sensitive NAA very low detection limits are obtained, e.g. 2.10(-16) g/g for U-238. This article describes these input factors and how they have been rea lized for the NAA of Liquid organic scintillators. The results are dis cussed in the context with the solar neutrino experiment BOREXINO, for which this work has been started. Possibilities for a further improve ment of sensitivity are presented as an outlook.