The organization of health physics and safety in U.K.A.E.A. were surveyed during the visit of the author to A.E.R.E., Harwell.
At A.E.R.E., Harwell, the number of operational health physicists expressed as a percentage of all staff employed is said to be the smallest, as well as Los Alamos Laboratory, U.S.A., among the establishments in the world and also the great deal of effort is made in the basic research of health physics. In this report, the organization of health physics and safety in U.K.A.E.A., especially at large reactors, compared with JAERI is described.