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The Atomic Energy Research Establishment at Harwell, founded in 1946. Some background and history. Activities of the Establishment in some detail. Results and achievements of work at the Establishment. Research projects. Harwell as a centre of research into the biological hazards of Atomic Energy. The measurement of fallout and of contamination by disposal of radioactive effluents. The difficulty of experimental evidence on the effects of very low doses of radiation because of the long time needed to acquire such data.