Toth $259 and TSO are measured dy beta countins, - ba tan sollectad on 1-1/8 inch paper or glass filters, The preeit The filters : oe aay sates ra are no wmted on Tracerlab brass ringeandedise holders, and covaread with d O01 plio= a film. This shows negligible absorption and prevents contami nation and loss of samples during handling. Counting is performed with 1 inch diameter Anton flat haloge =fillead GM. tubes moumted in simple lead castles, The background counti - rate of these counters is maintained at six counts per minute and th efficiencies at about 15=20%, Higher efficiencies could be obtained but re not cone sidered to be necessary, The counters are standardized wit potassium carbonate mounted on the same holders, A 0,200 gram quantity of potassium carbonate which should show 163 d/min (from the K+ content) rives suitable counting rates for standardization, The counting times were of the order of 50 minutas for backer und and samples ard all rasults are raported with the standard deviasions cal ulated for the error of the sample when the background error is taken info account. Figures 1 to 3 show the es values for background conting rate of 4, 6 and 8 o/min and counting times of 30, 60 and 120 minutes where th sample and backeround counting times are equal, (In ow normal work, 2s used, but in this report, the ls deviations are reported to c ceneral usage). lues ars orm with y90 samples are followed for decay for identification purpose stand residual aotivity, if any, is subtracted from the total Y, YO disint eafration rates are determined by extrapolation back to the time of saparatio nifrom the Sr90 parent but are not corrected for self-absorption ty the sample, Further identification is possible by absorption measurements when th © fample is sufficiently aotive. Some samples were analyzed for normal strontium in order to s tufy the up= Saks by plants and animals. Tho nitrate procedure is used for fhe separation Strontium of strontium from massive amounts of caloiium and other elsoments carrior carmot, of course, be used in this procedure but it hasbeen found possible to obtain good recoveries with a barium carrier, Th e wesulting precipitate is dissolved and analyzed for strontium with the flame photometer, Radium analyses were run on many of the samples. Ali samples es were analyzed by the standard method of co~precipitation of the with barium sulphate and alpha counting. This treatment is n ot Lonization chambers. ewer methods of analyses are in the development stage tut have used on any of the samples reported in this paper as it was felt | standardization was vary important where many results are to be c with one another. As noted earlier, the complete anal:tical proc are given in Appendix A,