When radiation toxicological monitoring of personnel is carried out following suspected internal contamination with alpha particle emitters, it is imperative that specific techniques be used to detect and measure the actinides present in the biological samples. The technique proposed here makes it possible to measure the activity of the uranium, plutonium, americium and curium isotopes on a single sample, without interference caused by the activity which is produced by the thorium and its descendants. This technique uses both the extracting power of new organic compounds fixed on inert resins, as well as the fixation and elution potential of the various actinides depending on the ionic composition and pH of the solutions used.

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