ICRP Publication 22. Recommendations of the International Commission on Radiological Protection. Inplications of Commission Recommendations that Doses be kept as Low as Readily Achievable. A Report of ICRP Committee 4 Adopted by the Commission in April 1973. 18 pages, 1 graph. Pergamon Press, Oxfored. New York. Toronto, Sydney. Braunschweig, 1973