3) they have made possible rapid calculations of future situations, should new nuclear test series or accidents take place. New nuclear tests whieh would produce large amounts of fission products should not be started, however, since a considerable number ef people may exceed the ICRP level of 5 pe 1375 alone due to the fallout which already exists but has not yet reached the man. In the next twenty years even larger groups of people Living in the reindeer and caribou meat-consuming regions of Alaska, Canada, Scandinavia and USSR may exceed the tighter genetic maximum permissible level for large groups of population, 5 rem, within 30 years, when to total integrated radiation dose from all sources of artificial contamination is reckoned with. The situation is made more grave by the fact that the very same group of people evidently have a considerably higher than normal body content of the natural radionuclides RaD and RaF. References L1/ "Observations of Radioactivity No 2", Year 1962, by the Finnisn Meteorological Office, Helsinki 1963. {2/ {£3./ Low,K. and EDVARSON,K., Nature (London) 187 (1960) 736. JOKELAINEN,A., PEKKARINEN,M., ROINE,P., and MIBTTINEN,J.K., Z.Ernuhrungswiss.3 (1962) 110. 74_/ PAAKKOLA,O. and MIBTTINEN,J.K., Ann.Acad.Sci.Fenn. ,Ser.All, Chemica, No 125 (1953). £5/ SALO,A. and MIETTINEN,J.K., Nature (London) 201 (196) 1177. {£6/ NAVERSTEN,Y. and LIDEN,K., 2nd Symposium on Radioactivity in Man, Chicago, Ill., Sept.1962. /7/ HVINDEN,T. and LILLEGRAVEN,A., Nature (London) 192 (1961) 1144. {8/ COMMONER,B., "Nuclear Information" 3 (1961) Nos.!-7,p.9. /9_/ MIBTTINEN,J.K., JOKELAINEN,A., ROINE,P., LIDEN.K. and NAVERSTEN,Y., Ann.Acad.Sci.Fenn.,Ser.AII, Chemica, No 120 (1963). f{1c_/ {i1_/ SALO,A. and MIETTINEN,J.K., unpublished. HASANEN,E. and MIBTTINEN,J.K., unpublished. fie/ "Radioaktivitetsmatnin:ar pa livsmedel 1962", Medicinalstyrelsens stralskyddsnamnd, Stockholm 1962. f{13_/ LIDEN,K., BENCTSSON,G. and NORDKVIST,M., 3rd Symposiis on Radioactivity in Scandinavia, lund, Sweden, May 1963. L187 CHANDLER,R.P. and WIEDER,S., Radiological Health Data 4 (1963) 317. poy yy ,