[en] The Australian Nuclear Association makes an annual award to a selected secondary school with an interest in furthering its activities in nuclear-related science. The award for 1999 has been made to the Ecology Group at Lake Gininderra College in Canberra for the project outlined below. It is being carried out in collaboration with researchers from the Department of Nuclear Physics and the Centre for Resource and Environmental Studies at the Australian National University. The poster will present details of the chosen site, sample collection, the chemical preparation of samples and of the accelerator mass spectrometry measurements. A preliminary interpretation of the data in term of residence times, erosion rates and down slope processes will be presented