10r for the Operation. The one individual who 11.24 Area decontamination was necessitated in two nstances. On Site Tare, Bikini Atoll, backfilling with uncontaminated coral sand minimized the radiation dose HEN personnel received while replacing a sea wall. On Site Yvonne, Eniwetok Atoll, decontamination of the QUINCE GZ allowed personnel to work in the area in preparation for the FIG shot. Decontamination was by removal of the top layer of sand. turned to the Mainland on 10 August and hence 11.25 At the request of Headquarters, JTF- 13-week-period guide: however, none ex- ceeded the 5r limit for the Operation. The high- est exposure was 4805 mr. One person, however, did exceed the 5r for the period from 1 January to 1 August 1958, receiving a total of 5036 mr. All five of these persons were on the list authorizing over 3.75r dosage for 13 weeks and up to received 5036 mr for the calendar year was re- received no further exposure during the calendar year. RADIOLOGICAL SAFETY OPERATIONS 11.19 The Rad-Safe Department of HEN em- ployed 14 persons during Operation HARDTACK. Of these, six were located at Site Nan, Bikini Ato’, and the remaining eight at Site Elmer, Eniwetok Atoll. 11.20 One electronics technician wes stationed at Site Nan and one at Site Elmer for radiation instrument repair. These nezsons worked with TU-6 technicians on all radiation meacur- ing equipment used at the twosites. 11.21 During certain periods. HEN maintained check-point monitors at the marine ramps on Sites Elmer. Yvonne. and Tare. These were special check-points established for the contzol Seven, the Rad-Safe Adviser served on the medical and technical team sent to Rabaul, New Guinea, to report on the medical and radiological situation aboard two Japanese IGY ships that had been exposed to an indeterminate amount of radiation during a short rain-out. 10-day period. However, due to a changein circumstances, this order was never executed. 11.27 TG 7.5 Rad-Safe support was not furnish- ed for the detonations at Johnston Island; however, an emergency team of four persons and 3 the necessary equipment were on stand-by, if the need arose. TRAINING personnel were conducted at Sites Elmer and Prior to Operation HARDTACK, Rad- Safe monitor training courses for H&N Nan. A basic mathematics test was given to ed underwater monitoring prior to authorizing applicants for the course to eliminate personnel crews, into the area. sisted of 20 hours of classroom and field training. Elmer and Nan provided the laboratory facili- ties for this work. The majority of the samples were counted for gross beta activity; the remainder were counted for alpha activity. The following is a summarvof the samples counted during Operation HARDTACK: Sea Water 0.0000 0. . ... 463 Rain Water... 2 00. 29 Fresh Water 0. Alpha Swipes Nese oe eee 2 ... . .... ... 60 eee Food oo. Sono Plant Specimens Page 64 we 1S eee Urine (tritium) 20 Marine Specimens oo 200 13 0, 20 _. ... .. Ce 6 ee B ft Charge of the Eniwetok TU-6 Detachment for a 1122 HE&N organized and trained a four-man underwater monitoring team that perform- A limited environmental sampling program was conducted as a joint function with TU-6, TG 7.1. Rad-Chem trailers at Sites eye The Rad-Safe Adviser. TG 7.5, was requested by CTU-6, TG 7.1, through Headquarters, JTF-Seven, to act as Officer-in- 11.28 11.23 & 11.26 of TG 7.5 personnel only. entry of personnel, such as divers and cable gy without the proper background. The course con- Fifty-three persons successfully completed the course. 11.29 In addition to the monitor training course, a two-hour indoctrination lecture was pre- sented to all HEN supervisorypersonnel. Aprroximately 230 foremen and supervisors were acquainted with the principles of radiological safety and with their responsibilities as workparty leaders when in contaminated areas. OPERATIONS OF TU-6, TG 7.1 11.30 The responsibility for all Rad-Safe operations rested with TU-6 of TG 7.1 for conducting all surveys to document the radiolog- ical situation, providing a plotting and briefing service, furnishing monitoring assistance to other Task Units, maintaining the registry of radio- active sources at EPG, advising about the pre- paration of radioactive material for shipment from the site, «onducting personnel decontamina- tion, and providing the necessary anti-contamination clothing and equipment. Vehicle decontamination, dosimetrv and records, instrument repair, and Rad-Chem laboratory facilities were shared jointly by TU-6, TG 7.1, and H&N. SON HDRES &» ~ 11.18 Four persons exceeded the 3.75r for a 7 oP PART Hii, CHAPTER 11 CHR HRaaAANHA HAH HAR HA HO HOH ARAH AARAARKR AARAaauaa GONEIDENLAU