摘要:The International Atomic Energy Agency (IAEA) hasbeen working with the Ethiopian government in theareas of agriculture, nutrition, nuclear medicine andisotope hydrology over the last four decades.Eight national and four regional Technical Cooperation(TC) projects (listed below) on isotope hydrology havebeen carried out in collaboration with various Ethiopianinstitutions over the last two decades (1991–2011).The IAEA has also been analyzing the monthly isotopiccomposition of rainfall samples collected from ameteorological station in Addis Ababa since 1961.