heneua ee EN yee s og 2 dads pall ini ° CEL ae eaae, " rotpsrbrnegrierces 18 " we ar : . - - — — o ‘ ~ + . ST - oro. - eR ys testesEON SE ert ter en eel hie tc yeaBae oe + LnsukesE Ny abatat 9° 45s Soe ELL Teach ont bige ah te wigs ae Tape eo te et eonar hab eedEE EANange geet so, pie eete cr tet EASArtin SSPTESetTP SARS ni -3- ee RADON CONCENTRATIONS MEASURED BY OTHER INVESTIGATORS IN COMPARATIVE LOCATIONS Avg. 10-15 ¢/1 New York City - Outdoors - 1943 "1952 " " Investigator oT Hess (4) 53.8 Hess (6) 103 1953: Sweden - Outdoors " - Equiv. Content Description " Rn Meyers & Hess (5) 100 Buildings Hultqvist (7) 1680 Hultqvist. (7) Portions of the data have been analyzed for variance. For the street samples, the variability between locations was + 29.2 x 10-15 c/l, and within replicates it was + 56.7 x 10-15 c/l. Incontrast, the variability between buildings was + 148 x 10-15 c/1, and within replicates it was + 68.3 x 10-15 ¢/1. Work is now being done to determine how much of the variability may be attributed to analytical error. Triplicate flask sam- ples are being collected simultaneously through a manifold in order to insure that each flask receives an identical sample. For the first three sets of triplicates collected by this procedure, the variation within ‘triplicates was + 22.6 x 10-15 c/l, and the variation between sets was + 46.5 x 10-15 c/l. These data viewed in relation to the earlier analysis of variance strongly suggest that wide concentration fluctuations may occur in any one location over a short period of time. FUTURE WORK At present the study is confined to New York to facilitate sample collection and analysis while the program is being developed. Eventually, the We hope to obtain reasonable study will be expanded geographically. . coverage of the United States. We are particularly interested in the variability of radon concentration as it may be influenced by different phenomena. which we will attempt to observe are: The kinds of variation 1. Absolute sampling and analytical reproduceability. 2. Instantaneous variability at a given location. 3. Temporal variations -- diurnal and seasonal with emphasis on correla- 4. Locational differences -- intra-city and geographical, correlating with geology. cH A) dwt tion with meteorology.