and many had to be replaced during the operation, After Shot 1, several rafts capsized although they were designed to withstand the effect of 4 10-Hf weapon, 5 miles distant. 3.2.3 Free-flostine Sea Stations The performance of free-floating buoys as collecting staticns was important to the main objectives of the present work, Although little data on fallout were secured from these stations, sufficient information was obtcined to determine the performance of the equipment and the suitability of the method. The following observations are pertinent: ; (a) Pexformance of the buoys and associated equipment was satisfactory, ‘he low-frequency transmitters together with the radio direction~-finding gear aboard Naval units provided an adequate system for locatiny and identifying the buoys. The handling problem in placement und recovery raised some difficulties, perticularly in increasing seas, but was satisfactorily met. (0) The free-floating buoy syste. was umsatisfactory for docu- menting fallout under the conditions of shot scheduling which prevailed after the first test. This statement would be true of any similar system having the prerequisite that the test take place within a 24-hr period specified 24 to 248 hr in advance, 3.2.4 Total Collectors From evidence given in Sections 4.2.1 and 5.1.2, modifications in the design of total collectors are indicated. Nevertheless, both devices used made satisfactory collections under same exposure conditions. As exrected from other experience, the principle of using simple continuously open (collecting) sampling devices was four? setisfactory whenever only total radiouctivity deposited per unit area was to be determined, cuch devices are not setisfactory where it is desired to preserve the charucteristics of the fallout because dilution by extraneous rain and dust occurs, 362.5 Belt Sampler The belt sampler was handicapped by too many moving parts which Were exposed to the elements. It was badly corroded by sea spray; sand lodged in the gears or under the belt and caused the sampler to function poorly. The collection from this sampler on Shot 1 was much better than on subsequent shots. in ClLupter 4, 3.2.6 Considerable valuable data were obtained as shown Liquid Droplet Sampler The prototypes tested at CASTLE failed to operate in most instances. This failure was due both to a faulty triggering mechanism for indexing the trays and to the absence of Jijuid droplets in the fallout from most shots. Nonetheless this differential collector has 42