Mn ee or oe ad etalaEte ten er were PU Smee os Oe ae he he Liaigon with TG-2.2-" . istLe ThomasRT <> eSuttmse-meetings were given by outstand” “Ostrom,MSC"~~ ing Scier-tists of TG 3. 1, members of the TU Liaison with TG 3.3 CAPT Harry H. Haight, Liaison with TG 3.4 Lt Col Karl H. Houghton, Operations Officers Maj Gerald M. McDonnel, . 3.1.5 stafi, and Gen Cooney. MC, USN MC, USAF MC, USA Lt Col Leonard A. Eddy, USAF Maj PayneS. Harris, MC, USA Supply Officer Maj Carl C. Carson, Radiation Dosage Records Communications and Instruments Lt Col John J. Maloney, MC, USA Prof Carl H. Menzer, University of Iowa Inf, USA DOG SHOT The winds and weather prediction for Dog shot indicated that ideal conditions would prevail. From the surface up to 20,000 ft the winds were from the east and east-northeast with velocities all above 15 knots. Above this level the winds shifted gradually from the north to the west. On the basis of Sandstone data no fall-out problem could be foreseen and CTU 3.1.5 so advised CJTF-3. Winds and weather at zero hour were as predicted. About 1 hr 40 min after the shot, the recording instruments in the radiological safety center Monitoring for exposure to tritium was carried out under supervision of Dean D. Meyer, LASL. An account of this work is given in Greenhouse Report, Annex 1.10. TU 3.1.5 headquarters was located in an aluminum building, the interior layout of which had been checked and approved by Gen Cooney. The building, although adequate, was not so large as would have been desirable. Office space, in particular, was cramped. Fortunately, the Officers’ Beach Club was located very near 2.2 TU 3.1.5 headquarters and was available for group meetings. It was found necessary to have rather frequent group meetings of the monitors, and the design of future radiological safety buildings should make provisions for space in which such meetings can be held. Training of monitors began shortly after their arrival in the Forward Area. Instrument calibration began at once, and familiarization with radiation detection instruments was made an important part of the training program. Monitors were assigned to the various projects on about 10 March 1951 and began work with project directors. The assignment of monitors to projects well in advance of the shot date was an innovation and had not been done at previous weapon tests. This plan was a definite improvement over previous methods of operation since the monitors were fully familiar with their projects and with the personnel with whom they were to work prior to shot time. Weekly meetings were held on Saturday mornings for purposes of critique, orientation, and education. indicated that a radioactive fall-out was occurring. The program director of TU 3.1.1 was notified and asked to notify all project directors of his unit to take measures to protect photographic films. The occurrence of fall-out at such a short time after zero hour was a cause of consider able concern from a health standpoint. The problem presented two aspects, the external and interna] hazards to personnel. The intensity, as it increased, was constantly checked both inand out-of-doors. The radiochemical section of TU 3.1.5 began a study of the particle size. For more detailed information concerning the fallout and particle sizes involved, see Sec. 2.6. At about 1400 of D-day the intensity began to decrease, and it became obvious that external radiation accumulated by personnel would not be large. More detailed information concerning radiation dosages appears in Secs. 2.6 and 2.7. It is a well-established fact that particles must be 5 microns or smaller in size to constitute an internal hazard. All data and facts at hand indicate that no particles smaller than 20 microns in size were present on populated islands. Therefore it is assumed that no internal hazards were present. A total of 125 urine samples were analyzed. Three samples showed somewhat high counts on the first specimens, but a second sample on each individual, collected under supervision, ‘was normal. TU 3.1.5 encountered no other radiological problemsin the test program. Excellent co- om come ese eececee, . ~ ————— CONFIDENT$eOINEORMATI ON wearers HS ome NR ee mam re EEREOR Cee et SRT eine eenee PR 8 TC SETY