Bioscel, and Sigmatron. Since the dose in the cloud was obtained indirectly from the NBS film packs, these are also an indirect source for the average dose rate in the cloud. 2.3.7 Dose Rate at Cloud Exit, The dose rate at cloud exit due to contamination on the aircraft was taken directly from the P-Meter and Bioscel curves. It was also derived by extrapolation of the decay-rate curve from the T1B decay measurements, ~ 20302 Decay Rate on Paturn Flight. The decay rate of the contanmination during the return flight was obtained directly from the F-Meter curves, It was also obtained by extrapolation of the decay rate curve from the T1B measurements. 2.3.9 Contamination Factor. The contamination factor is expressed in percent per minute in the cloud and is defined as: Dose rate in cockpit at cloud exit (Average dose rate in cloud) (Minutes in cloud) x 100 (261) It is a measure of the degree to which this type of aircraft (B-578B) be- comes contaminated by flight through the cloud as reflected by the radiation dose rate in the crew compartment after exit from the cloud. It is significant in predicting that portion of the total dose which is derived from contaminaticn on the aircraft during the flight back to base. It is calculated directly from data recorded by the P-lMeter. The contamination factor was computed also using the dose rate at cloud exit as derived from T1B measurements and the average dose rate in’ the cloud indicated by the NBS film packs, 2.4 MASTER DATA SHEET The large mass of data was summarized on a master data sheet. One of these sheets was filled out for each penetration flight. A typical Sheet is shown in Appendix A, Some additional data on radiation dose rates in the cloud at tines later than 1 hour after detonation were obtained through the courtesy of ~ the Test Aircraft Unit. These data were collected during the cloudSampling operations of this unit, 21 BEST AVAILABLE COPY