I - However, a group of film badge readings was obtained covering a range of values which varied with exposure conditions (Reference 3). These readings are summarized in Table 2.3. Several badges were worn both outdoors and indoors. One badge which remained outdoors over the 28.5-hour exposure reached the upper limit of 98 r given in the table, Several other badges kept inside a refrigerator indoors gave the lowest value of 38 r., Skin contamination in the Rongerik group appeared to have been much reduced by the protective measures taken and the resulting beta doses appeared clinically to hava been clearly lower than in the other groups, TABLE 2,3 = Film Badge Readings on Rongerik Location of Badges Calculated Dose to Badges (r) Indoors and Out lk to 52 Outdoors only 98 Inside Refrigerator Indoors 2.3 | 38 LATER SURVEYS During the period 8 to 11 March, more extended surveys of each of the islands were made by a monitoring team equipped with five AN/PDR-39 instruments (Reference ), of the survey 80~-curie Co Twenty-four hours previous to the departure party, three of the instruments were calibrated on an source and cross checked at 0.320 r/hr, where they were found to be in close agreement, Using these instruments, measurements were made in the inhabited areas of all four islands at waist height (approximately 3 feet above ground}, Table 2.4: is a summary of these data, Since these later readings were made under better controlled conditions than the emergency surveys at the times of evacuation given in Table 2.2, the data of Table 2.) were taken to be the best measure- ment at a given time of the gamma dose rates in air and were used in the calculation of the total external gamma dose, No information existed on the quantity of beta contamination on the skin of any of the exposed individuals, Further, no experimental data allowed any reliable calculation of the beta dose rate to an individual from fission products on the ground. Thus the only basis for any estimate of external beta dosage was data from other field tests and fallout measurements, This question is discussed further in Chapter 8, and a rough estimate for possible beta dose from the ground is made there, :