geostemnien maSS SESE EOREMIATION +. eet shot fall-out cas ao 3:“ include dases ~ from Dog anv E+ ‘sii Guts. The large doses to‘be @..2eh 05 cesen iru vie fall-out having - occurred af cvch » Inc ume. (See, however, paragraph of Sec. 25.) External Radiation Doses to 28 May 1951 An anaiysis of all radiation exposures as shown by photographic film badges was made as of 28 May 1951, the day before the departure of TU 3.1.5 staff from Eniwetok Atoll. The exposure data presented represent only that obtained in various missions concerned with the test program and do not include doses obtained from Dog, Easy, and Item fall-outs. Film badge data from 3,335 individuals show an average exposure of 510 mr. Excluding 913 persons with exposures of 100 mr orless, the average was 710 mr. The distribution of doses received is shown in Fig. 2.13. 2.8 SUPPLY AND EQUIPMENT In general, there were remarkably few supply and equipment problems for TU 3.1.5 during Operation Greenhouse. The only two items of equipment with which difficulty was experienced, the AN/PDR-T1B Radiac training sets and Mine Safety Appliance Co. dust collectors, have been discussed in Sec. 2.1. Major items of equipment are listed in Appen- dix E. For a certain few of these items which might not be considered necessaryfor future tests, see the discussion of instrumentation in Sec. 2.9.7. The original request by CTU 3.1.5 for 2,000 units of protective clothing was filled in adequate time. It was later necessary to order an additional 1,000 units, and these, too, were received in adequate time. All survey meters were received in time ex- cept the AN/PDR-T1B’s. Instruments were received without batteries; but batteries were drawn from general stock, and the instruments were completed and ready for calibration on time. Particular attention should be paid to the battery problem in future operations since some of the required batteries are not of common vintage. Radiation counting laboratory equipment and photodosimetry equipment were complete and ready for operation upon arrival of TU 3.1.5. . wegenfe cometat rt as eadTOa napaareangeenine meeck wa ——! eee ---~ wert:éceived on schedule. However, upor. calibration it was found that the film packs leaked the parenthetical note in the next to the last 2.7.6 ware mee - va“The 15,000photographic film bauges requested light around the perforations which formed the identifying numbers of the badges. This was overcome by wrapping the film badges in black photographic masking tape. Shortages of this tape, of which large quantities were required, necessitated special air shipment from the United States of additional supplies. For future operations, film packs should be carefully checked for light leakage at the point of manu- facture. Instrument repair tools were adequate after certain additional small tools were drawn from the AEC supply. For power tools considered desirable for future test operations see Sec, 2.9. Requests for expendable supplies were filled on time and in adequate quantities except for certain batteries which were, from time to time, in short supply. Had radiation detection instruments arrived with batteries as originally requested, this situation would not have arisen. Supply facilities in the Forward Area were adequate. Radiological safety personnel were able to fabricate certain items for which need always arises and for which the requirement cannot be foreseen. Such items, therefore, are seldom in stock. In general, the materiel and supplies re- quested before the operation were adequate, with little oversupply and no known deficiencies. 2.9 INSTRUMENT OPERATION, REPAIR, AND MAINTENANCE This section concerns the operation, repair, and maintenance of radiation detection instruments of the field survey type as well as some special modifications found desirable and useful. Some suggestions are included which may be helpful in future operations. Information was obtained through maintenance and repair work on all instruments used by TU 3.1.5, both of the field survey and laboratory type as well as field survey instruments used by other units. Repair and maintenance was conducted in a dehumidified room, in the radiological safety building, which was quite satisfactory. However, instruments were stored in a stock room having atmospheric conditions closely