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dation of the Agency's International Nuclear Data Committee. The main reason for organizing this course was that neutron measurement techniques are used in many laboratories in developing countries both for research and for technological applications. Different sources of neutrons are used for these measurements. Among the most common are neutron generators, research reactors, charged-particle accelerators of various types and for various energies, and isotopic neutron sources. The number of such facilities in laboratories in developing countries is constantly growing, partly with the support by the Agency's Technical Co-operation Programme. It is a continuous responsibility of the IAEA to assist these laboratories in the profitable utilization of these devices in technological research and educational applications. The whole programme of the course and the lectures presented in this report in particular gave an opportunity to the participants to become acquainted with the latest developments in the field of fast neutron measurements, in the studies of neutron interactions with nuclei, and in related technological applications of immediate benefit to their countries. CONTENTS Some aspects of the production and application of radioactive isotopes............................