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  • Author or Editor: C. Bland x
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Abstract  

Gamma-ray spectrometry of liquid or finely divided solid samples may be facilitated by incorporating standard activity additions. The count rate rises linearly with added activity, and the intercept and slope of the 1.s.f. line permits the intrinsic activity of the sample to be found. Applications of this method in the determination of210Pb and Th activity are described.

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Abstract  

A lanthanum fluoride precipitation method for the separation of18F produced from the18O(p,n)18F reaction in alkali halide salts is described. This radiochemical separation method minimizes interferences from other positron emitters produced by proton bombardment and makes the accurate determination of ppm-level18O in complex alkali halide systems feasible. The interference from the19F(p,d)18F reaction is eliminated by keeping the proton energy less than 8.2 MeV. Applications of this technique to studies of dissolved oxide species in molten alkali halide salts are discussed.

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