Chapter 4 CONCLUSIONS 4.1] RESIDUAL-GAMMA-EXPOSURE RATE The results of the residual~gamma-exposure-rate measurements showed that for some devices tne decuy exponent varied with both the type of device and the station location. The decay exponent was fuirly uniform for different station locations for Shot Zuni (1.04 to 1.18) and ruther variable for various station locations for Shot Navajo (1.07 to 1.39). Although no special significance was attached, the spread of values for the :lecay exponent seemed to be greater when the average value was high and smaller when the average value was low. The residual~instrumentation system perfurmed at about 50 percent of its capability. This was explained by the fauifure of the recorders, which were not designed as field instruments and were used tecause no others were available. There were no known failures of the Conrad detectors. 4.2 INITIAL-GAMMA-EXPOSURE RATE Figures 3.27 anc! 3.28 show that approximately *h, of the tota)]-initial-gamma exposure wus delivered aftcr the arrival of the shock front. Insufficient initial-gamma rate or dose datu was availuble to allow independent comparison with publisned scaling laws. Figures 3.29 and 3.30 indicate reasonable agreement of both Redwing Projects 2.1 and 2.2 data points with TM 23-290; however, measured dose-versus-cistance curves ex- hibit a steeper slope than shown on Figure 4-3, page 4-12 of TM 23-200, thus indicating substantial deviations at short and very long ranges. 4.3 BEACH-BALL OPERATION This experiment demonstrated the operutional feasibility of using the beach-ball technique to drop a radiological telemeter onto a contaminated area. 4.4 THERMAL-RADIATION DETECTOR The thermal-radiation detector operated satisfactorily for 4 5~Mt detonation at a distance of 20 miles. 4.5 RECOMMENDATIONS Because of experience gained by Project 2.5 during Operation Plumbbob, it is recommended that this experiment, with improved instrumentation, be repeated on other high-yield events, especially high-yield air bursts. 52