in general, will range between 10,000 feet MSL to the maximum altitude attainable, It would be desirable for the sampling aircraft to have a routinely attainable maximum altitude of at least 60,000 feet. It should be mentioned that, if space requirements for gas sampling equipment are incompatible with the configuration of a particular aircraft with excellent altitude performance, we would like to reconsider the space requirements, 3e Estimated Endurance At Desired Altitude: 3.1 The flight time required at any altitude is a function of the radiation exposure required and the radiation intensity in the cloud. A flight time capability of one and one half hours, exclusive of the time required for arrival and departure and rendezvous at the sampling area, should suffice to fulfill any normal radiation exposure requirements. The minimum time exclusive of maneuver requirements, should be taken as twenty minutes, , he Number of Samples Desired: 4.2 A maximum of six samples will ordinarily be required, If the filter units carry approximately the same area of filter paper as the F-8)G units, six samples will correspond to twelve aircraft which should be operational at all times, If a larger aircraft is used, which can carry double the amount of filter paper, six aircraft would be required, Sufficient spare aircraft to insure this operational capability should be available, may occasionally be desirable to use all aircraft, It including spares, which are in operational order, Se Aircraft Instrumentation Desired: 5.1 The sampling aircraft should carry the following radiation instrumentation: 5.1.1, Airborne gamma radiation dosimeter with a maximum 5.1.2 Airborne radiation rate meter with a range between 5.1.3 exposure range of 7.5 roentgens, 05 and 500 rf/hr. Sample radiation monitoring instruments including electronic components and controls. 217 SWEH~2-003) ' 20° AFWU/AG Y