SE «(UNCLASSIFIED oth Sx89 and Y9° are measured by beta counting, collected on 1-1/8 inch paper or glass filters. The precipitates are ‘The filters ade mounted on Traceriad brass ring-endediso holders, end covered with 0. eiim. This shows negligible absorption and prevents contaminafion and lose of samples during handling. Counting is performed with 1] inch diameter Anton flat halogentubes mounted in simple lead oasties. The background sounting theese counters is maintained at #1x counts per minute and the at about I8-cOk. sidered to be Higher efficiencies sould be obtained but ar necessary, The sowmters are standardized with carbonate mounted on the same holders, A 0,200 gram quantity carbomate which should show 163 dfain (fram the £t° oontent) counting rates for standardizatior, " The counting times were of the order of 30 minutes for tackgr ani all results are reported with the standard deviations cals the error cf the sample when the background error is taken int potassitm s suitable d and samples Figures 1 to 5 show the 23 values for background conting rates 8 o/min and counting times of 30, 60 and 120 minutes where the bample and background counting times are equal, (In our normal work, 28 vpluse are used, but in this report, the le deviations are reported to conform with ceneral usage). Y90 samples are followed for deony for identification purposes activity, if any, is subtracted from the total Y. Y°° aisinte are determined ty extrapolation back to the tims of separation gr 90 parent but are not corrected for self-<absarption by the s identification fs possible by absorption measurements when the sufficiently active, Some samples were analyzed for normal atrontiim in order to at “ale by plants and animals, The nitrate procedure is used for of strontium from massive amounts of caloiim and other elements carrier camot, of course, be used in this procedure but it hasibeen found possible to obtain good recoveries with a barium carrier. The precipitate is dissolved and analyzed for atrontiun with the f gesulting Radijun analyses Were run on many of the samples. All semples e were analyzed by the standard method of coprecipitation of the With barium sulphate and alpha counting. ‘This treatment is not for soils, so a new procedure was devised in which the radium ig ace precipitated with the heavy metals by ammonium hydroxide and sodium care donate and the daughter product, radon, measured in ou standard radon Newer methods of analyses are in the development stage but have fict been ionization ohambers. uted on any of the samples reported in this paper as it was fel standardization was very important where many results are to be with one another. As noted sarlier, the complete analytical pr are given in Appendix A. 00131986 O10 1091039 ;