gummed paper mcunted on water resistant cardboard. In both methods, the collectors were continuously exposed from the time of their placement until recovery. Samples obtained were used primarily in determining the final fallout distribution patterns. 3.1.2 Differential Fallout Collector fhe differential fallout collector (Fig. 3.2), employed to collect fallout as a function of time was an improved version of the belt sampler used during IVY. It was employed on most land and many lagoon stations. It was designed to expose 40 jars consecutively at 5 min intervals after being started by a signal from a light-activated trigger. This equipment was powered by a 6-v, 110-amp-hr storage battery. 3.1.3 Film Badge Pack Use was made of the National Bureau of Standards film badge pack to measure the integrated gamma rediation dose at each station where fallout was collected. These dosimeters were provided and procossed by Project 2.1 personnel. 321.4 Gamma Time-Intensity Recorder The gemma tine-intensity recorder was used in conjunction with a data reduction system, to provide long-term, continuous information relative to radiation fields. It consisted of a series of ionization chambers, associated electrometer and relay circuitry, and EsterlineAngus pen recorders 22/ The information for each chamber was stored cs & simple pulse, euch of which corresponded to the basic increment of gamma radiation for the siven chamber, Tho system was essentially of the charge integrating autorecycle type, the chamber being recharyed to its original voltage as each basic increment of radiution was received | and recorded. The basic chamber increments were 0.1 mr, 10 mr, lr, and. 100 r covering the range from 0.1 mr/hr to 10,000 r/hr. The instrument was powered by ten 150-amp-hr betteries, eight of which were in series providing 48 v for the relay circuits and power to drive the pens in the Esterline-angus recorder; the other two were in parallel providing 6 v for the filaments of the amplifier tubes in the detector heaus, A spring-driven mechanism moved the paper in the Esterline-Angus recorders. 3.1.5 Prototype Collecting Devices Severel protetype instruments sere tested for their possibilities as fallout und bare surge sumplers. Two such instruments were the elece trostetic precipitatcr end the automatic water drop collector. ‘he samples collected by these instruments wero analyzed at the LENRDL. The results are given elsewhere .18/ The electrost:tic precipitator was developed as a fog sampling device to obtain informaticn on cize, radioactivity, snd ionic content of individual liyuid aercsol particles, The sampling was uccomplished "7