Gordon M. Dunning a -2- 29 July 1954 ‘Three members of YAG 39 and YAG 40 returned film badges reading 13.5, 55 and 135 roentgens. Investigation revealed that the badges had been left aboard these experimental ships during radioactive fall-out and do not reflect their true exposure, It is to be ncted that the unit encountered badge tampering in three organizations located at Bikini for the longest period (TG 7.3 and 7.5). Eleven Task Group 7.4 weather station personnel on Rongerik Atoll received exposures approximating 40 roentgens and one weather reconnaissance pilot received 17 roentgens. These first exposures are considered to be the highest actual exposures encountered by JIF Seven personnel during Castle. Two members of Task Group 7.5 exceeded twelve roentgens due to extended work in contaminated areas and equipment. One individual accrued his exposure due to the fact that he went to sleep aboard a highly contaminated LCT that was being transported back to Eniwetok aboard the Belle Grove. This exposure was an avoidable exposure that resulted from the uncontrolled "roll-up" of equipment from Bikini. The great bulk of Task Force exposures between 6 and 12 roentgens are due to the Navy ship decontamination project and the Air Force cloud sampling project. Whether the value of the decontamination project justifies the exposure or not, I cannot judge, but without these two projects the operation could have easily been completed with exposures of less than 6,0 roentgens. Enclosed you will find a tabulation of exposures listing numbers of personnel rather than percentages, I am being ordered to the Command and General Staff School for a period of 1O months and, before lesving, would like to express my appreciation to you anc Dr. Bugher for your complete cooperation. After the school I hope to return to be the first radiological safety officer to say that he had no overexposures during a test operation, Sincerely yours, ReD. Sous — OUN D. SEAVIS enc. ce: Tabulation of uxposures TU-7 File w/enc. Dep/Admin., TG 7.1 w/enc. H&R w/o enc. US DOE ARCHIVES 396 U.S. ATOMIC ENERGY _ 2 MISSION RG __DOt ths foricw ( DB) Box 3 SES Collection Folder Le L2 DOS ARCHIVES