et Altogether about 80 personnel were utilized in activities cee a eeep 2 devoted to safety. Radiological Surveillance Radiological safety (Rad-Safe) was a separate Task Unit within the Joint Task Force organization. Rad-Safe responsibilities included procuring, storing, and issuing Rad-Safe supplies and equipment, instrument maintenance, issuance and processingof film badges, maintenanceof personnel radiation exposure records, supervision of monitoring, decontamination, waste disposal activities, procurement and distribution of high density goggles, and other activities as indicated by the poten- tial hazards of the situation. The Rad-Safe Branch contained an Off-Site Surveillance Section. Personnel from this section participated in monitoring at off-site populated islands in the vicinity of the test area and periodically collected water and food samples. Aircraft Monitoring Aircraft were used to monitor the cloud of airborne radioactivity during early times after detonation and to track the cloud periodically over a period of two or three days. Environmental Safety During Operation Dominic (1962) there were 35 nuclear detonations above the Pacific Ocean near Christmas and Johnston Islands. The explosive vields of these devices ranged from low kiloton into the megaton range in TNT equivalent. The height of burst for each detonation was sufficient to negate local radio- active fallout. The devices were delivered to the point of detonation by either manned aircraft or by surface-to-air mis- siles. In addition to the atmospheric tests, there was one underwater test of a low yield nuclear device detonated in the Eastern Pacific Ocean several hundred miles from the closest land area. Essentially all the radioactive fission products produced bythis test were deposited in the ocean and were soon dispersed and diluted to concentrations which were of no significant biological hazard to man or marinelife. . All nuclear events at Christmas Island were detonations of devices released from manned aircraft. These bursts oc- curred over water and were planned for execution under favor- able atmospheric conditions to minimize the likelihcod of contamination of land surfaces. In addition, following each event, ground and aerial monitors surveyed the island to determine whether any radioactive rain-out occurred. A Hazards Evaluation Unit composed of scientific personnel tH of contractor laboratories (Lawrence Radiation Laboratory, 46