OPERATION IVY DATE: TIME: PPG time 1 Nov 1952 O715 Mike GMT Sponsor: 31 Oct 1952 1915 SITE: LASL . PPG - Eniwetok - Flora 12° 14' 162° 11' 1k" ki" Site elevation: TOTAL YIELD: 10.4 mt HEIGHT OF BURST: FIREPALL DATA: Time to lst minimum: 270 to 310 msec Time to 2nd maximum: 3 to 3.5 sec Radius at end maximum MM CLOUD TOP HEIGHT: CLOUD BOTTOM HeIGHT: CRATER DATA: N E Sea level Surface TYPE OF BURST AND PLACEMENT: Surface burst on coral soil and water 98,000 ft MSL 59,000 ft MSL Diameter: Depth: 6,240 ft 164 ft REMARKS: Most of the fallout occurred over the open sea. Documentation of the fallout was thus limited to the islands and the lagoon of Eniwetok atoll. The lagoon dose rates were determined by multiplying the readings obtained on rafts by the factor 7. This factor is based upon the ratio of Operation Jangle field dose rates and readings taken over flat plates after their removal from the contaminated area. The data presented for the lagoon stations can thus be considered as approximations only. The island dose rates are based upon groundand aerial-survey readings and were adjusted to H+l hour by using the t-1"* law to approximate .he decay. 51