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