Comparison of spectra in various groups of people at Rongelap Atoll in 1958 shows that there is littie difference between those exposed in the 1954 fallout and those not exposed, A small group of people who moved from a non-contaminated island to Rongelap isiand only 2 1/2 months previous to the present survey had less than one~-haif the ce? level and less than one-third of the level of zn°> of the Rongelap residents. A greaup of 56 people who had been living, until a month before the survey, on a slightly more contaminated island about ten miles to the north showed slightly hisher cs? peaks than the inhabitants of Rongelap Island. Because the 1958 data has not been subjected as yet to the thorough analysis, the quantitative statements regarding the body burdens are pree liminary. However, on the basis of counts:smade with appropriate standards corrected for absorption and geometry, it is estimated that the body bur137 dens of Ca is 0.3-1.3 po and 1,0-3.G ue of zn*, (The body burden of the Rongelap people of cst? at 1 day after exposure in 1954 is estimated as having been about 0.01-0.02 uc.) The spectra of whole body gamma activity seen in 1957 and in 1958 of one of the Rongelap residents are compared in BPigure 4. In both spectra cai? arc zn®> are responsible for most of the gamma activity, but the 1953 levels of both are much higher than those seen in 1957. is seen at 1.6 mev in the 1958 spectrum. An additional peak This peak was a prominent feature of the background spectrum and has tentatively been ascribed to Lat*°, It is probable that the pat4°_,140 isotopic pair reaulted from fallout con — tamination from the 1958 Pacific test series. The ship containing the steel room was slightly contaminated before proceeding from Eniwetok to Rongelap.! 7. The abdsence of peaks except at 1.6 mev and the fact that external procedures such ag washing down the decks and removing contaminated deck paint definitely lowered the background inside the room (from about 70,000 cpm to, about 25,000 cpm total counts) indicated that the contamination was outside the steel room. 14