Order number 940406-171827-13 set 5 with 102 of 102 GFFICIAL USE ONLY page 46 counts taken on the 74th post-exposure, and none of these values had returned to control levels. Studies of bone-marrow specimens revealed no significant abnormalities. Minimal amounts of residual radioactivity were detectable in the urine of approximately 1/3 of the 801. Item 150. 110. 70. 710. KEYWORD (S) ‘ exposed individuals. ‘ BETA PARTICLES/biological effects ;CASTLE/fallout ; MAN/biological radiation effects ;BONE MARROW; CASTLE; FALLOUT; HEMATOLOGY; RESIDUAL RADIATION RADIATION HAZARDS; MAN; URINE; RONGELAP; 82 REPORT NUMBER PRIMARY TITLE (M) WT--936 Nature and extent of internal radioactive contamination of human beings, plants, and animals exposed to fallout. Addendum report for project 4.1 Operation Castle [of] PERSONAL AUTHOR (M) Cohn, S.H. CORPORATE SOURCE Naval Radiological Defense Lab., San Francisco, CA (United States); Naval Medical Research Inst., Bethesda, MD (United States) CLASSIF. LEVEL TEXT Official Use Only 34. 950. ABSTRACT The objectives of this study of internal radioactive contamination are as follows: (1) To determine the nature and extent of the internal radiation hazard to human beings exposed to the fall-out from Bravo Burst. (2) To evaluate the contribution of the internal contamination to the acute and long-term radiation syndrome. (3) To determine the feasibility of by exposed animals, food plants, an internal decontamination therapy program. (4) To determine the amount and type of contamination sustained 801. KEYWORD (S) soil, ANIMALS ;MAN; PLANTS; CASTLE;FALLOUT; 5003420 and water of the contaminated atolls. Evaluation of the internal contamination of the human beings was made by a study of the radioelements excreted. Since very little information is presently available concerning the ratio of excreted radiocelements to the amount deposited in the body, it was necessary to base the evaluation on data obtained from animals that had been contaminated in the same event. Detailed studies of animal tissues and animal excreta then provided data on which estimates of the human body burden were based. ANIMALS/radioactive contamination ; “ ANIMALS/biological radiation effects ;MAN/radioactive contamination ;MAN/biological radiation effects ; PLANTS/radioactive contamination ;PLANTS/biological radiation effects ;CASTLE/fallout ;BRAVO BURST/fallout ; OFFICIAL USE ONLY RADIATION HAZARDS