2 lap who had received 175 r, and was less miarked part of the control group used for the growth and developmentstudies of the exposed children. The accumulation of data from these surveys is in the other grouns receiving less exposure. The hemepoictic depression was roughly + .opertional tu the dose of radiation received. Even in the 157 Utirik people who received only an estinvited 14 1, it was possible to distinguish stight platelet depressron in the group as s whole. The smaller group on becoming increasingly voluminous. Since condi- tions have not been favorable for performance of extensive statistical analyses or use of electronic computing procedures to store and manipulate the data, the annual survey reports published by this Laboratory are made as complete as possible. This Ailingnae und Rongerik showed peripheral blood levels between those of the high and low exposure groups. The chronological records of blood tfad- report, therefore, includes a considerable amount of raw data, much of it in appendices, so that others may have an opportunity to make further ings in the Rongelap and Ailengnue groups are prrsented in Tuble 10 anclin Appendices | and 2 calculations if desired. Lymphopenia of about half the devel of the com- parison Marshallese population was evident when the Rongcelap people were first examined on their arriva) at Kwajalein 3 days after exposure, This depressed level was maintained steadily with only slight increase noted by one year. In the following year, mean counts approached the levels of the comparison population but have since generally Summary of Past Findings Reports have been published on the findings of surveys made at the foliowing times after exposure; initial examination,’ 6 months,? 1 year,?2 years,‘ 3 years, 4 ycars,* 5 and 6-yeers] and. years." Thedollowing is brief summary ings sreviewtlyeepeeoea. : Duringghe fir2449 48hr ter = wow, einheure ~.--, faMajnudslightly.below. Rewtrpphil igvels iggtualcd. considerably during ut” - the first“menth} ‘po lythis wus related to the % of the Rongelapgpeopte- saperigneedan wea =" - prevalénee of beta burng*ol. the skin during that andnausca. A fess vomited, aigk:dew sdiasrhew. | fe.Bextrophil depression became cvident by Maay a! experienced Htehiz burning¢ and ‘af thes dad & wégks post expasare With levels reaching “aboyt half:that of thecomparisen population. This skin, and a fewcomplpined@G burning f the vas Mi apy arent:increased iafectigua phocesses, and remainceasympt@inatic:wut Gagspoled. that neutrophilic Icukocytosis the aceaest, when cut Eee 5,as”posablein people showing cugual infections hair G&¥tloped, due lar the skin: It.wasappare eamined,” agew. D Ae aier Ceposire, “tf sea eh efi *. tie, Néltzophil. levels” recovered more j Man lyphhocyte Icvéls and reacheu near caneonan y defresscd'and’t are"© épAtrol lg!s bysonc ycar-#ibsequent annual sur‘significant doscs of radiation had-pre bly;Bee veys.juve ‘revealed that recovery docs not appear whole-¥6d ‘lost of "to Becomplete, particularly in younger and older : Tage troups. 4 Platelet counts showedJess Nuctuation than other blood-cotnts und fairly ceegmst@ntly showed inurable anwugieof ra Pattive ‘material had also creusing dépression, reaching.levels of about 306% been absorfily graligh effects of the radiathat 6f thesamparison population by the 4th week. tion can beste summatized underthree headings A spurt offecavery to abspt_75% of comparison according tordfic modgna of penetraling.ir- teceived. In addition to, radiation and the betairré jon of ieSkty. fictto chemical analyses of the:pris ie showed that meas- radiation, skin irradiation, da nee Ry levels occutted ” during the: “folfbwing fow weeks, : Fglwhich: wat fallQWgby-xlawer“recovery but with ° Onc of the curlicst sities indicate staight of cant exposure in these people was lowering oflevels of leukocytes and platelets of the peripheral blood. This was most marked in the 64 people on Ronge- “meat, leWRneverschching higherthan 85 ta YOU comparison populidion during the 7 a a post.exposifte. , = rythropvietic depression has not been a consistent finding as with the leukocytes and thrombocytes. Slight depression of red blood counts, hemutocrits, and hemoglobin have been noted at times.