iy a : PART Ill, CHAPTER 11 11.18 Four persons exceeded the 3.75r for a 13-week-period guide; however, none exceeded 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 thelist authorizing over 3.75r dosage for 13 weeks and up to 10r for the Operation. The one individual who received 5036 mr for the calendar year was returned to the Mainland on 10 August and hence received no further exposure during the calendar year, RADIOLOGICAL SAFETY OPERATIONS 11.19 The Rad-Safe Department of H&N employed 14 persons during Operation HARDTACK.Of these, six were located at Site Nan, Bikini Atoll, and the remaining eight at Site Elmer, Eniwetok Atoll. 11.20 One electronics technician was stationed . at Site Nan and one at Site Elmer for radiation instrument repair. These persons worked with TU-6 technicians onall radiation meaczuring equipment used at the twa sites. 11.21 During certain periods, H&N maintained check-point monitors at the marine ramps on Sites Elmer, Yvonne, and Tare. These were special check-points established for the contzol of TG 7.5 personnel only. 11.22 H&N organized and trained a four-man underwater monitoring team that perform- ed underwater monitoring prior to authorizing entry of personnel, such as divers and cable crews, into the area. 11.23 A limited environmental sampling program was conducted as a joint function with TU-6, TG 7.1. Rad-Chem trailers at Sites 11.24 Area decontamination was necessitated in two instances. On Site Tare, Bikini Atoll, backfilling with uncontaminated coral sand minimized the radiation dose H&N personnelreceived 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. 11.25 At the request of Headquarters, JTFSeven, 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. 11.26 The Rad-Safe Adviser, TG 7.5, was requested by CTU-6, TG 7.1, through Headquarters, JTF-Seven, to act as Officer-inCharge of the Eniwetok TU-6 Detachmentfor a 10-day period. However, due to a changein circumstances, this order was never executed. 11.27 TG 7.5 Rad-Safe support was not furnished for the detonations at Johnston Island; however, an emergency team of four persons and the necessary equipment were on stand-by,if the need arose. TRAINING 11.28 Prior to Operation HARDTACK, RadSafe monitor training courses for H&N personnel were conducted at Sites Elmer and Nan. A basic mathematics test was given to applicants for the course to eliminate personnel without the proper background. The course consisted of 20 hours of classroom andfield training. Fifty-three persons successfully completed the course. 11.29 In addition to the monitor training course, 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 summary of the samples counted during Operation HARDTACK: a two-hourindoctrination lecture was presented to all H&N supervisory personnel. Approximately 230 foremen and supervisors were acquainted with the principles of radiological safety and with their responsibilities as workparty leaders when in contaminated areas. Sea Water 00.0.0... 463 OPERATIONS OF TU-6, TG 7.1 Rain Water..............eccecseseesseees 29 11.30 The responsibility for all Rad-Safe opera- Fresh Water ...............ccccsscsceeseeee 2 conducting all surveys to document the radiological situation, providing a plotting and briefing service, furnishing monitoring assistance to other Task Units, maintaining the registry of radioactive sources at EPG, advising about the pre- Alpha Swipes oo... 60 NOSE 0... eecescecesssesecssseecsseeeosseees 200 POO ooo.ciceecceccseesceceensecesseesseeee 15 Sod] ooo cececceeseeeceeteeeseneeees 13 Urine (tritium) |... 20 Marine Specimens ....................... 6 Plant Specimens ...........0....0.00.04. 3 Page 64 tions rested with TU-6 of TG 7.1 for paration of radioactive material for shipment from the site, conducting personnel decontamination, and providing the necessary anti-contamination clothing and equipment. Vehicle decontamination, dosimetry and records, instrument repair, and Rad-Chem laboratory facilities were shared jointly by TU-6, TG 7.1, and H&N. PAASKRHEHKHKHHHHHHHHHHH HHH HHH RHE eat eee TAt ner ST.