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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RÉSUMÉLa surveillance du personnel exposé aux produits radioactifs repose, selon les radionuclides en cause, sur des dosages qui nécessitent la maîtrise de techniques radiochimiques appliquées aux échantillons biologiques. Toute optimisation des critères techniques ou du facteur temps est extrêmement profitable. Après un rappel des principales techniques habituellement utilisées pour le dosage des actinides et des radioémetteurs bêta, les auteurs présentent les nouveaux composés permettant l'extraction des actinides et du strontium à partir de matrices mises en solution nitrique. Les avantages analytiques sont détaillés : dosage de la totalité des actinides sur un même échantillon, limites de détection améliorées pour l'uranium, gain de temps, spécificité dû dosage du strontium.ABSTRACT According to the radionuclides involved, trie monitoring of personnel exposed to radioactive material implies determination by means of radiochemical techniques applied to biological samples. It is very useful to be able to optimize the technical criteria and the time-factor. A brief review is made of the main techniques used for the determination of actinides and beta emitters. The new compouds making it possible to extract actinides and strontium from substances in a nitric solution are presented. The analytical advantages are described: the determination of trie totality of the actinides on a single sample, improved detection limits for uranium, time-saving, specificity of strontium determination.

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