intensities led to flight procedures and maneuvers which reduced risk of high exposure and consequently increased the proportion of flight time spent in the cloud when radiation intensities were low, The amount of radioactive debris collected relative to crew exposure had been increased through use of high-speed aircraft and the development of high-capacity filter units for these aircraft. Shielded flight clothing increased significantly the amount of material it became possible to collect, Finally, development of specialized instrumentation provided accurate operational control over radiation exposure during flight, Quantitative Considerations h - In planning radiochemical experiments it was usually possible to determine how much post-explosion debris was required in a sample to perform these experiments and to express this requirement as a function of the predicted energy release, In the first place, a sufficient amount of the “unburned" components of the bomb were usually required to permit an accurate analysis for them in the presence of unavoidable amounts of these components, introduced by the collection medium or laboratory manipulations, In the second place, a sufficient amount of a radioactive substance formed in small quantity in the explosion might be required to permit its chemical separation and "counting" within acceptable limits of statistical error. Whether planning for a single nuclear test explosion or for a series of test explosions, officials needed to know whether piloted aircraft were capable of collecting the samples desired. An estimation of this capabi- lity and subsequent planning were based on: 200 APA HO SWEH-2 -0034