CHAPTER Ill, SECTION 5 (Neg. No. W-W-401-1) Figure No. 3-11. Donning Protective Clothing at Rad-safety Check Point — Yvonne. in Radex areas. It was found that in some underwater areas the radiation intensities were in excess of 50 roentgens per hour. Rad-safety divers were instrumental in detecting and re- covering a radioactive source which had been dropped from a barge into 85 feet of water. H&N Rad-safety personnel assisted TU-6, TG 7.1, in the issuance, collection, and process- ing of film badges. Daily rosters were compiled of all H&N personnel who had accumulated dosages in excess of 2000 mr. After the first 13-week period of the operation, a daily roster was issued covering all personnel whose accumulated dosages were in excess of 4000 mr. Contributing significantly to the dosage of all personnel at Eniwetok Atoll was the fall-out that resulted from the KOA event in early May 1958. This fall-out contributed up to 1500 mr to those persons who remained at Eniwetok Atoll for the duration of the Operation. It became necessary, therefore, to request that the limitation of 3750 mr dose per 13-week period be increased and the 5000-mrdose for the Opera- tion be increased to 10,000 mr for 35 H&N employees. These were personnel whose work was of such a nature that their absence would have seriously handicapped the accomplishment of the Operation. As of 20 July 1958, only 4 of the 35 employees had exceeded the 3750 mr guide, and none had exceeded the 5000 mr limit. Page 370 Following is a summary of the dosages received by TG 7.5 personnel as of 20 July 1958: DOSE IN MR’ NUMBER OF PERSONS 0 674 19.5 PERCENT 1 to 500 521 15.1 500 to 999 362 10.5 1000 to 1999 1352 39.3 2000 to 2999 432 12.6 3000 to 3750 81 2.4 3751 to 5000 19 0.6 — Over 5000 0 0.0 Total 3441 100.0 The Fs-3 Film Evaluation System, built by Eberline Instrument Company, was used for processing the film and interpreting the optical density to mr dosage. Film used was a 2-film packet containing Dupont Type 502 and Du- pont Type 834 films. Film packets were dipped in ceresin wax prior to sealing in vinyl plastic cases. On 1 April 1958 all TG 7.5 personnel were issued operational film badges. All initial issue