Belgium (Continued) G/R.210 AVERAGE DOSES RECEIVED BY THE PERSONNEL OF CEN FROM 1954-1957 Summarizes the results of monitoring the professional exposure in nuclear energy education centre in Belgium. Film strips enables one to differentiate the exposure to beta, gamma, and neutron radiation. Only average doses of the personnel are given. Brazil G/R.34 and G/R.34 (Add.1) ON THE INTENSITY LEVELS OF NATURAL RADIOACTIVITY IN CERTAIN SELECTED AREAS OF BRAZIL States that Brazil has areas of intensive natural background where thorium sands are present. Gives description of a survey on four sample areas which were selected with regard to: (1) the geological structure and genesis of their active deposits; (2) the extension, configuration and intensity of their radiometric levels; (3) the extent and variety of possible biological observations and experiments. G/R.36 ‘ MEASUREMENTS OF LONG-RANGE FALLOUTIN RIO DE JANEIRO Gives information on measurements of airborne activity in Rio de Janeiro, including tables showing decay curves of activity of samples and concentration of fission products in air during the period May —July 1956. G/R.38 ABSORPTION CURVE OF FALLOUT PRODUCTS Is connected with G/R.36; gives absorption curve for fission product of an airborne activity sample obtained byfiltration. G/R.169 ON THE NATURE OF LONG-RANGE FALLOUT Describes one surprising high value of daily collected fallout activity due to a Single big and highly active particle. G/R.169 Correction to above report. (Corr.1) G/R.188 SUMMARY -STRONTIUM-90 ANALYSIS IN DRY MILK AND HUMAN URINE G/R.189 ON THE COMPOSITION OF LONG-RANGE FALLOUT PARTICLES A Single fallout particle of large dimensions and relatively high activity was found by daily monitoring of fallout. A detailed investigation of the nature and activity of this particle is presented. G/R.190 ON THE UP-TAKE OF MsTh 1 IN NATURALLY CONTAMINATED AREAS Gives preliminary results of an investigation on the uptake of natural radioisotopes by plants and animals in thorium-bearing area. Canada G/R.9 REPORT ON WASTE DISPOSAL SYSTEM AT THE CHALK RIVER PLANT OF ATOMIC ENERGY OF CANADA LIMITED Describes procedures and results of ground dispersal of radioactive wastes from a natural U heavy water-moderated reactor. G/R.10 THE CANADIAN PROGRAMMEFOR THE INVESTIGATION OF THE GENETIC EFFECTS OF IONIZING RADIATION Describes a proposal to modify the system of recording of the national vital statistics so as to render useful for genetic analysis the information contained in certificates of births, marriages, and deaths (see also WHO WP 1). 177