b. The general types of equipment tested wore gamin dosimeters and beta monitors for aircraft interiors, cloud trackers and detectors, airborne ground intonsity survey metors, and droppable, telem.tering crater survey units, The radiac equipment was installed in a Novy PeV-2 aircraft and in an Air Porce BL? aireraftt. The B-L7 emphasized tracking the atomic cloud while the P2V-2 emphasized test of the cloud-tracking equipment for only the first hour or less, duvoting attention then ta ground survey and droppings of the telometcring units into the crater area, es The recording gamma dosimeters operated in excellent fashion throughout the sufficiently high-intonsity arcas were entered to permit full-scale deflection of the recorders. The cloud-tracking equipment was able to detect the cloud ab dis~ tanees up 20 miles but the operation was handicapped by such things as power failure, The range of detection was highly dependent upon the sige ef the cloud which, in turn was dependent upon the yield of Lhe weapon, The lowost yield shot in which the pro- ject participated wave the least conclusive snd least satisfactory of the results, d. The ground survey cquipment was hendicapped by malirbenance and opera~ tional problems, but in general the results wore satisfactory for the purpose. The droppablic, belemetering crater survey units were succcssfully monitored in only about 50% of the cases, The principal cause of this deficiency was bolicved te have beon the Pailue of the antennae to erect properly after the units Landed on the ground, h A contributing cause lies in the fact that each unit transmits only 5 minutes of each hour and uncertainty in tho preci each unit at the proper time, time of transmission made it difficult to reccive The uncertainty in time of transmission arose from in- herent inaccuracies in setLing the transmission tame on the clock mechanism. This source of error was removed before the third shot by starting the clock mechanisms. at precisely determined times shortly before launching the units from the aircraft, @. The beta cabin monitor performed satisfactcrily in both project aircraft Tn order to prevent an exeussive radiation dose, the aircraft avoided too close an approach to the atomic cloud, Of necessity, therefore, the green light, indicating safe conditions, remained on at all times, Similar equipment, however, was installed in a drone aircraft which penetrated the cloud and recerds indicated that it operated satisfactorily at red light, or danger lovels, f£. ALL of the radiac cquipment installed in the two project sircraft per- formed satisfactorily during at least one shot snd, in all cases, sufficiently well to establish the validity of their operating principles and achievement of their de- signed performance, Occasional lapses from optimum performance are attributed to