CHAPTER 2 PROCEDURE 2.1 OPERATION Five B-57B aircraft which were instrumented to measure gamma radia- tion dose rate, integrated dose, and conditions of flight were flow through the clouds resulting from the detonator ranging in yield. On the day prior to a shot, all of the instrumentation was checked for proper operation, installed in the aircraft, and readied for use. The flight crews were briefed on the desired flight pattern, altitudes and times of penetrations, and forecast development characteristics of the cloud. These characteristics included size, stabilization levels, and drift. All aircraft took off at predetermined tims in order to permit proper positioning at shot tims, After the shot was fired, the cloud was surveyed visually by the director in the lead aircraft. Positions and times of penetration were then finalized. Penetrations were made at intervals of from 4 to 10 minutes and at varying altitudes, This time spacing permitted some of the results of the first penetrations to be used in planning the succeeding penetrations, Two types of maneuver were utilized in the penetration phase. In both cases the cloud was approached in straight and level flight. After entering the visible cloud, the pilot either executed a standard 150degree turn and made his exit or continusd on a straight course through the cloud. The type of maneuver to be employed was decided prior to the penetration rung Howsaver, the aircrews were briefed on emergency pro- cedurss which permitted changing from the straight-through to the 180- degree-turn maneuver at their discretion if excessively high dose rates were encountered. A dose rate two times greater than the predicted dose rate was considered excessive. Upon exit from the cloud, the aircraft returned to base. and the records were removed immediately for analysis. 2.2 INSTRUMENTATION The follo instruments and devices were used to obtain data for this project: (1) KAEC Model M1432 automatic-recording radiation-rate mater (P-Meter); (2) Bioscel (1M-111 (XE-1)/UD) radiation-rate meter; (3) Sigmatron radiation-integrating dosimter; (4) quartz-fiber dosim eters (Bendix Models 619 and 622) radiation integrating dosimeter; (5) National Bureau of Standards (NBS) film packs radiation-integrating dosimeter; (6) Rad-Safe personnel film badge, radiation-integrating dosimeter; (7) AN/PDR-39 (T1B) radiation-rate meters; (8) intervalomster; and (9) photopanel. BEST AVAILABLE COPY LB