-35- ; AECD-3446 Engebi Island, a shot island, was surveyed on August 13, Activity on the and was high but changed rapidly with distance from the tower posts. ,ifwas even higher, being approximately 50,000 to 100,000 c/m or more, At the Activity Vegetation on the i ‘fatand was limited to grass and low-lying shrubs, the counts of which could not be fF 5 "distinguished from the counts of surrounding sand, 4: Rujoru Island, the second island to the northwestof the shot island of } = 5 non, a distance of one mile from the test site, was also monitored on August 13, i . “Allareas of the island were monitored but no special pattern of activity was obE “perved. For the beach, values ranged from 80 to 340 c/m and for the land, from i “Fooo to 7,000 c/m. It was later discovered that the counter used for this survey & was slightly light-sensitive and for that reason the values are a few counts per ‘ minute greater than the actual value for the area being monitored. ate The shot island of Aomon was surveyed August 14, The pattern of distri- bution of activity appears similar to that for Engebi, especially in regard to the highactivity found in the area about 300 yards from the bombsite. In Figure 2 therelationship of activity to distance from the bomb site is shown for Aomon Island, It is to be noted that the distribution is wave-like in pattern which suggests thatcollecting stations near bomb site areas may vary considerably as to amount of activity within short distances, Beyond the 300-yard area the counts dropped . r from 100, 000 c/m to about 1,000 c/m within the next 100 yards. Activity confears of Aomon Island are shown as a portion of Figure 1, Because of the location etthe bombsites on Engebi and AomonIslands, practically all land surveys were up-wind from the point of bomb detonation. However, within short distances of —-*-—~- thebomb site, prevailing winds probably hadlittle, if any, -influence upon the dis;‘tribution of fission products. Aomon like the other shot islands was stripped of vegetation other than grass and a few low bushes. i “pete og A, =cn On, a Ry pp8 i Biijiri Island, which is joined to Aomon by a causewayand is southeast _ of Aomon, was also monitored August 14, In general the average count was about 180 per minute but occasional points of higher activity were found, indicating speck "Contamination, For sand, values ranged from 90 to 320 c/m; for grass, from 50 AOCTIVES NIVERSITY 4° o JU UNIV. OF WAS. bo