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  • Author or Editor: W. van der Mark x
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Abstract  

A routine method is presented for the determination of fluorine in small bone samples by activation analysis with fast conversion neutrons. Both the purely instrumental determination and the analysis by chemical separation are discussed. The activations are performed with the AVF cyclotron of Philips-Duphar at Petten. Use was made of a rabbit system equipped with a Be-target, which can be inserted in the internally deflected beam of the cyclotron. The sensitivity of the instrumental method is ≈1 μg. Application of chemical isolation results in a sensitivity of ≈0.1 μg.

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Abstract  

A rapid method for the radiometric determination of fluoride concentration in aqueous solutions is presented. The method depends on the chemisorption of HF on a glass adsorber from a dilute acid solution, which has been spiked with18F. The limit of the determination is 0.03 μg/ml. Applications to surface water and urine samples are discussed.

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Abstract  

The isotope dilution method, which is based on the isolation of a constant substoichiometric amount, can be completed by a group of radiometric techniques in which this amount is a function of the concentration to be determined. It is convenient then to plot the experimental data in such a way that a straight line is obtained. The methods which can be used in the application of this principle are discussed, mathematically treated and compared to the original procedure of RŮZIČKA and STARÝ. Expressions are derived for the relative statistical error and the limit of detection.

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