2 240, 2? 240, 415 the chemical yields for iron atom concentrations of originally present in the samples. in each sample, 242 mass tracer 39, was added during the chemical dissolu- Standard chemical procedures were used for the isolation and purifica- tion. Specific activities were tion of O34, Jolen, and 24]a, calculated from the measured atom Gravimetric measurement of the concentrations and appropriate decay recovered nickel and samarium - constants. carriers provided yields for the 6 Ni : 1 and Sm samples. The addition of determined mass spectrometrically, 283 am tracer was required to determine traced plutonium samples was required. the yield of the 24d samples. Alpha pulse-height analysis was also Nickel was purified by numerous pre- essential for the quantification of cipitations as nickel dimethylglyoxime. 241an. The rare earth, samarium, was separated americium samples were determined from americium on a Dowex 50 cation- from the exchange column by gradient elution of 238 oy and 2A was accomplished with a-hydroxyisobutyric acid. by the ratio of the characteristic Since 385, could not be alpha pulse height analyses of 42ou Chemical yields for the 3am tracer. Quantification alpha peak areas to those of the appropriate tracers. MEASUREMENT TECHNIQUES Thin NaI(f1) and planar Ge(Li) Strontium-90 was determined by beta diode pulse-height~analysis detection measurement of the chemically separated systems were used to measure the 64-h 20, daughter. characteristic 6-keV Mn x ray of ° Fe. Interferences from radiochemical contaminants were All samples were measured by Nal(T1). identified and eliminated through Ge(Li) detection systems served to least-squares analysis of the data. confirm results and extend the sen- These procedures are rather common sitivity for for determination of the long-lived 90 Sr parent. lower levels. Plutonium—239, ire detection to Sixteen samples were analyzed for their 240, and 241 were Fe content. Nickel-63 and samarium-15l were separately quantified via mass determined by liquid scintillation Spectrometric measurement techniques. counting at LLL with a Packard Observation of the characteristic Tri-Carb spectrometer. mass-to-charge ratio for each isotope Errors reported with each result provided the means of separation represent the measurement uncertainty and measurement. and are based primarily on counting To determine the =~ 1?~ «agg? 3010054 2 EASENT TNT | te THORS Ande, 2 ETT