portation, Since a survey of all individuals’ showed (hat there was SaRncant contiimimation of skin and clothes, prompt decontamination was instituted. Clothes were removed and Laundered, There skin and hace wece washed repeatedly with fresh water and soap. In ony adtividuals, partieufirfy in the Maurshatlese, owas difficult to wash Che radtatetive maternal trdme fhe hair because of the heavy coconut of hur dresstig used by these people. Table it Group Designation EXPOSED AND CONTROL UNEXPOSED GROUPS Total Number inGroup Distance fram Biking (Nault. Miles Approximate Effective Thne of Fallout 28 1ad H+ 6.8 he Aiericans, Exposed Rongerth 3 Instrument Readings Used tn Dose Calculations est Estimate oof Total Gamma 280 nr chr Hot o dave 7H Hee 50 hr $75 mrehe 175 (16 people) He Slr Ht 7 days Time of Evacuation H + 28.5 hr (8 men) Dose ta Airc) H+ 34 hr (20 men) Aine rienns, 105 Controt Kway American Marshallese, 64 105 Hoe ahr hx posed Maaipee lang Attingetinae Utirik . iB 197 Marshallese, Control Majure Group a3 H+ 4hr 270 H+ 22hr 117 (48 people) H+ Sehr . 100 mrvhr H + Y days Started at 40 mr/br Hi SS hr Completed at H+ 78 hr H + 8 days 69 14 Total Exposed — 267 Total Controls ~ 222 *See Section 1.4.3, 1.4 ESTIMATION OF WHOLE BODY EXTERNAL DOSE The estimated values of external dose given in Table 1.1 were based on readings of AN POUR-39 tield instruments. Averages of a sumber of dose rate measurements on each island ata piven time were used. The readings were taken in air, approximately 3 feet above ground, severa) days after the inhabitants were evacuated. Before this time, adequate surveys with well calibrated instruments had not been possible. Several variables which influence the results are indicated below. These will be discussed 1a greater detail in an addendum report on external dose, which will contain the data, methods and calculations by which the external dose analysis was made. \.4.1 Energy Distributionof the FalloutGamma Radiation,ItsVariation WithTime, the Response of the Meter in Each Energy Region andIts Correction Factor for the Total DoseSpectrum Fallout deposited as an effectively infinite plane source resulted in the dose-energy histogram shown In Fig. 1.2. Its energy distribution was the result of degradation of the original . aeoe . e » peseee . 16