A study of totel & activity and racicstrontium in rain water was undertaken at HASL during the spring of 1956. At that time a survey of atmospheric aerosols and the elemental constituents of rainfall was being conducted by the Cloud Physics section cf th. .ir forec tameridce Research Center. The samples from the network of stations were analyzed by a contractor, Skinner and Sherman, of Boston, Massachusetts. HASL received a part of the total month's sample from each site, if there was sufficient sample for both laboratories to run analyses. Sampling covered the period from March through July 1956 for 61 stations within the continental United States, Bermuda, Newfoundland, and the Azores, The criginal purpose of the study at HASL was to correlate the amount of fallout in rainfall with the estimate of total fallout from gummed film measurements» PROCEDURES Collection, The rain collection devices consisted of one-liter polyethylene bottles equipped with wide-mouthed funnels that presented a surface area of 0,56 square fect to the atmosphere. was The whole assembly enclosed in a wooden container designed to be opened manually during rain and closed at other times. Figure 1 is a photograph of this apparatus as it was used in the fiela,?? Analysis: JVihen each sample was received at HASL the volume was measured enc the sclutien acidified.*? Then the sample was evaporated to a small voluce, transferred tc a glass planchst and dried for beta e eountin:. This residue was fuse. with sodium certcrate and the strontium 4 —% >= on he ee a : ~ -~ Net, - wate woe a RRA se Dae BSN SR oe . .= = Lo SE - 7; wee Ee TS gy eee ay Ta Se eg tee . a CURPP EE TET ne Ta oe ee , = ~ SS x sy] 8 . ™~ . a Ss ~ = *\u * SS oo PRE eee . ue a" sey ARS = Sa mM se Se _