In March 1987 the International Commission on Radiological Protection established a Task Group which was requested to evaluate dose per unit intake for members of the public. In Section I, this report incorporates age-dependent physical models and appropriate biokinetic information. Section II reports on doses per unit intake of isotopes of hydrogen, carbon, strontium, zirconium, niobium, ruthenium, iodine, caesium, cerium, plutonium, americium and neptunium. Detailed appendices give extensive information on bone models for actinides, and inhalation dose coefficients.