External radiation levels on Eneu were among the lowest found in the atoll ranging from 0.002 mR/hr to 0.01 mR/hr (see Table 1). This is lower than the U.S. average. Nam The third largest island, Nam, contains large open areas covered with fimbrisytkis and ipomea vines. A full set of ionization chamber, spectrometer, and portable instrument measurements were made on Nam. The monitoring paths passed around che island and across it in several places. total exposure rate. Endrik Radiation levels varied widely and Nam contained a considerable quantity of radioactive acrap metal. The radionuclide identified with fhe coe ty scrap and the major contributor to the external radiation field was Endrik is the Largest island on the southern rim of the reef and the fourth Largest in the atoll. It is about one kilometer west of Eneman. &xcept for the eastern tip, Endrik is heavily vegetated with dense undergrowth in the interfor. There were stands of cardia and pisonia trees and several pandanas trees. Several transects from lagoon to ocean shores were surveyed in the eastern part of the island but survey of the wider western portion was less sytematic due to heavy vegetation, 7cs was another lesser contributor and !25sb was found in small amounts. *h SUTmATY of results for Nam is given in Table |, Bilantuak, Tomelen, Rojkere, Eonjebi These very small islands located between Bikini and Eneu were monitored with G-M counters only. The observed levels were quite low and uniform (see Table 1). G-M counter readings on the eastern part of the island generally ranged from 0,003 to 0,010 mB/hr with one area near the eastern end reading 0.030 mR/hr. Some radioactive scrap metal was found on the eastern end. The western part showed variations in levels similar to Bikini - low levels near the shore and higher levels inland. A transect near the center showed values ranging frdm 0,003 mR/hr near the shore up to 0.019 m&/hr in the interior. Another This three kilometer long complex of five narrow islands interconnected by man-made causeways lies along the southern rim of the atoll, From east to west these are Aerokoj, Aerokojlol, Bikdrin, Lele, and Eneman. An aircraft runway was constructed on Aerokoj and Aerokojlol which are almost indistinguishable as Separate islands. These islands have acattered vegetation and the grass covered ground was used by a considerable number of nesting birds. Survey measurements with the scintillation counter and G-M counter were made along a route down the center of these islands with spet measurements nearer the ocean and lagoon shores. Readings were quite low and uniform with a range for the G-M counter of 0.003 to 0.01 mR/hr and for the scintillation counter of 0.001 to 0.003 mR/hr. The western tip of Aerokojlol is connected to the next island Bikdrin by a long causeway. Bikdrin plus the next island, Lele, are wide places in the causeway. Except for some pieces of scrap metal on the causeway showing higher radiation levels, the measured values were low and uniform along the causeways and islands. The scintillation counter showed 0.006 to 0.008 m&/hr and the G-M counter about 0.010 mR/hr. eeane cennt neege ee Aerokoj-Eneman Complex transect west of center showed 0.009 mR/hr near shore to 0.235 mR/hr in the interior. Slack algse-covered depressions near the western end gave G-M counter reading ranging from 0.EL to 0.22 hr. Analysis of soil samples from the western end indicated that Qn Lukoj, a range of values on one transect showed 0.061 mR/hr to 0.104 by scintillation counter and 0.063 to 0.130 mR/hr by G-M counter. On the next transect near wmid-ieland the ranges were 0.100 to 0.171 mR/hr and 0.083 to rest primarily to 137¢s. along the igland, Levels increased to 0.020 to 0.060 mR/hr. The eastern end Toward the west The algae covered They are small with shore areas covered with ipomea vines and have densely vegetated interiors, Monitoring coverage wae obtained by cutting two transects on Lukoj and by circling Jelete and pushing inland about 30 meters at every 90 meters of circular path. algae and almost no vegetation. Wide variation in radiation levels were found on ZEneman. 5$b contributed about These two islands in the southwest part of the atoll are about one kilo- meter apart and are similar in appearance. 0.197 aR/hr. was similar to the other four islands, 0.001 to 0.01 mR/hr. h, and Lukoj-Jelate Eneman is the Largest and western-most island in the string. The eastern and central portions contain thick vegetation. This bacomes less dense toward the west until at the western tip there are low depressions covered by black °'Co, 85 percent of the total exposure rate with 137¢8° contributing about 12 percent. A sodl sample taken near island center indicated that 60 percent of the exposure rate was due to 62¢0, 30 percent to 125sb and 102mgh, and the . On Jelete the levels measured along the circular path ranged from 0.063 to 0.130 mR/hr. No soil samples ware obtained. depressions which had been near test locations showed 0.100 to over 0.500 mR/hr. Oroken-Bokaetoktok-Bokdrol ul of Eneman, These three istands near the western end of the Yagoon are very small and are similar in appearance. Bach has a densely vegetated interior and there are many nesting birds. The highest value in the atoll, 0.570 mR/hr, was measured in this western end The western end of Eneman contained quantities of radioactive scrap metal in the form of steel cables and pieces of reinforcing rods embedded in concrete fragments. Soil samples from this area indicated primarily ®%¢o activity with considerable 125sb, *55gu, and }92ah activity. There was little l3?cg activity. As determined from soil sampling, 60¢0 accounts for 83 to 87 percent of the 8 Radiation levela on Orcken ranged from 0.017 to about 0,040 mR/hr. on Bokaetoktok ranged from 0,010 to 0.030 mR/hr. Values In each case the higher levels were found in the interior of the islands. Bokdrolul showed Less variability with levels away from the shore line ranging from 0.024 to 0.036 for both scintillation and G-M counters. There was one G-M counter reading of 0,050 aR/hr. No soil samples were taken. Bokbata All that remains of Bokbata.is a small sand island containing zero vegetation, This sand island is located southwest of the Bravo Crater. The radia-