aap | SUGTECT, TO. Extormel Raiintion Fron Fall-dut Following Shot Iten Ocruumier, Task Unit 3.1.5 2. At approximtoly J ¢ § hours ani 23 mimites guum ray recorder at RaiSafe building, Perry Island showod a aharyp rise followed by a drop to nearly the original reading. This *gpike" is interpreted as the result of the possaps of an active elawl fron which Little material fell out. Several ether "spiims® of activity appeared dioring the next ‘few minutes and were followed by a stoatly rise an notivity due to fail-oxt until abart 4 hours 45 minutos, Fallout started arninat 8 hexose seni continued until f3,hours hb minutes. ¢ 16 hours the activity deaayed according to a %7*** lay, 2 Fran A sutinuous record of gam ray intensities have been mintained. attached curve shows the record eannected to m'/hr at an outside lopation. Tho Starting at ¢ 12 hours integrated doses out of doors have becn determined using poclkst ion eharbers ani photazraphie film badsees. These have been placed at losntions refresentative ef oonfitions on Furry Islani. Se Tao integrated dove eub of dours has heon @oternined by mnarioal intes ration of the intensity curve 4n the early phases and fran direct dose mamrements dn the later phases, The sumlative dose curve is attached. he An incanplete but reasonably representative survey of Eniwetok Zsland indicates that the situatim there is almst identigal with that on‘Farry. bio data are svAdilable fran Japtm. 5e AsSuning that decay eontimes according to a qrie2 yaw at 4s possible to predist total doges for future timss. For X #15 days total axpested doses is 7,370 m I #30 days total expected doses is 9,520 m Atomic Energy Act 1946