DECORPORATION OF TRANSURANIUM ELEMENTS DE PENDING ON THEIR CHEMICAL FORM AND THE WAY OF CONTAMINATION

We have measured the efficacy of a local DTPA treatment after intramus cular administration of Np(IV) and Np(V) into rats, A significant deco rporation was only observed after contamination with Np(IV) when the c helator was administered within minutes after contamination, We have a lso performed a chronic DTPA treatment after exposition of rats to MOX aerosols, This treatment decreased the extrapulmonary retention of al pha emitters by a factor of 3-5. These results point out the need of b iokinetics studies concerning the chelators and the actinides to impro ve the efficacy of decorporation.